当前期刊: Journal of Low Temperature Physics Go to current issue    加入关注   
显示样式:        排序: IF: - GO 导出
我的关注
我的收藏
您暂时未登录!
登录
  • Critical Rotation Rate for Vortex Nucleation in Ultracold Rotating Boson Atoms Trapped in 2D Deep Optical Lattice at Finite Temperature
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-05-25
    Ahmed S. Hassan, Azza M. Elbadry, Alyaa A. Mahmoud, A. M. Mohammedein, A. M. Abdallah

    In this paper, the critical rotation rate for vortex nucleation in ultracold rotating boson atoms in 2D deep optical lattices is calculated. We suggest a semiclassical approach to calculate the critical rotation frequency at finite temperature through extension of Stringari threshold formula. The critical rotation frequency is parametrized in terms of the thermodynamic potential. Depending on the semiclassical

    更新日期:2020-05-25
  • Solvable Model of the Thermal Persistent Current at Low Temperatures of Two-Electron Parabolic GaAs Quantum Dot
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-05-25
    F. S. Nammas

    Abstract We have studied analytically the persistent current and the magnetization of two electrons trapped by a circular parabolic GaAs quantum dot using the canonical ensemble approach. We have investigated their behavior as a function of the dot size and magnetic field in the presence and the absence of the harmonic e–e interaction at high and low temperatures. Our investigations reveal that the

    更新日期:2020-05-25
  • Fabrication of Bismuth Absorber Arrays for NTD-Ge Hard X-ray Microcalorimeters
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-05-22
    S. Ferruggia Bonura, D. Gulli, M. Barbera, A. Collura, D. Spoto, P. Vassallo, S. Varisco, M. Santamaria, F. Di Franco, A. Zaffora, L. Botta, U. Lo Cicero

    The high-spectral-resolution detection of hard X-rays (E > 20 keV) is a challenging and nearly unexplored area in space astrophysics. Traditionally hard X-ray detectors present moderate spectral resolutions, although few tens of eV one could open new frontiers in the study of nuclear processes and high-temperature plasma dynamics in energetic processes. This can be achieved by using cryogenic microcalorimeters

    更新日期:2020-05-22
  • Low-Temperature Magnetic Properties and Magnetocaloric Effect of Fe–Zr–Cu Amorphous Alloys
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-05-19
    Weiming Yang, Wenyu Li, Chao Wan, Juntao Huo, Jinyong Mo, Haishun Liu, Baolong Shen

    In this work, low-temperature magnetic properties and magnetocaloric properties of Fe91−xZr9Cux (x = 0.0, 0.4 and 1.0) amorphous ribbons were investigated. It was found that the Curie temperature (TC) of the ribbons increases with Cu content from 210 (for x = 0) to 218 K (for x = 0.4), and decreases to 214 K with the further of 1.0% Cu. The values of the maximum magnetic entropy change (− ΔSM)max were

    更新日期:2020-05-19
  • Observation of Frequency Up-Conversion Gain in SIS Junctions at W Band
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-05-18
    Y. Kozuki, Y. Uzawa, T. Kojima, W. Shan, T. Sakai

    We have developed a test setup to measure frequency up-conversion gain in superconductor–insulator–superconductor (SIS) junctions at W band (75–110 GHz). A conventional SIS mixer with Nb/AlOx/Nb tunnel junctions was used as a frequency up-converter. An up-converted signal is measured by a room-temperature down-converter system. We observed distinct intermediate frequency responses to signal inputs

    更新日期:2020-05-18
  • Magnetocaloric Properties of Gd 1−x Ho x MnO 3 Multiferroic Compounds
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-05-18
    N. Pavan Kumar, Jyotirmayee Satapathy, Durgesh Singh, Manju Mishra Patidar, V. Ganesan, A. Srinivas, M. Manivel Raja

    A series of Gd1−xHoxMnO3 (x = 0, 0.1 and 0.2) compounds known to exhibit multiferroic properties has been investigated for their structural, magnetic and magnetocaloric properties. X-ray diffraction analysis confirms the presence of single orthorhombic phase at room temperature in all the compositions. Low temperature magnetocaloric properties of these compounds have been studied through specific heat

    更新日期:2020-05-18
  • New Approaches to Low-Energy Calibration of Cryogenic Detectors
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-05-16
    M. Ghaith, W. Rau, M. Peterson-Galema, P. Di Stefano, E. Fascione, R. Germond, R. Underwood

    Searches for dark matter with cryogenic detectors are pushing to lower energy thresholds at each development stage. Consequently, new approaches for detector calibration at the proposed energy scales are necessary. In the case of SuperCDMS SNOLAB, energy thresholds in the range of a few eV are expected. In this paper, we are reporting R&D work for new ideas to calibrate cryogenic detectors in the eV

    更新日期:2020-05-16
  • Experimental Validation of Calorimetric Electron Capture Spectral Theory with $${}^{193}$$193 Pt
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-05-10
    K. E. Koehler, M. W. Rabin, M. H. Carpenter, M. A. Famiano, C. J. Fontes, D. R. Schmidt, C. M. Smith, A. D. Tollefson, J. N. Ullom, M. D. Yoho, M. P. Croce

    Using microcalorimeters, a high statistics, high-resolution calorimetric spectrum of electron capture in \({}^{163}\)Ho can be used to determine the neutrino mass. The spectral shape can be calculated from first principles with various assumptions and approximations. To determine the validity of these choices, the theoretical calculations must be compared to data from multiple isotopes. New calorimetric

    更新日期:2020-05-10
  • Effect of Yttrium Doping on Magnetic Properties and Magnetic Entropy Change of Bilayered Perovskite La 1.3 Sr 1.7 Mn 2 O 7
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-05-07
    Fengze Cao, Yi Lu, Hongye Wu, Bao Xu, Xiang Jin, Jianjun Zhao, Xiaodong Sun

    La1.3−xYxSr1.7Mn2O7 (x = 0, 0.025) samples are prepared by the conventional solid-state reaction. X-ray diffraction spectrum reveals that the samples are in the Sr3Ti2O7-type tetragonal phase with the space group I4/mmm. By decreasing the temperature, two samples exhibit the paramagnetic phase at high temperatures to two-dimensional short-range-ordered ferromagnetic states at the intermediate temperatures

    更新日期:2020-05-07
  • COSINUS: Cryogenic Calorimeters for the Direct Dark Matter Search with NaI Crystals
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-05-02
    G. Angloher, P. Carniti, I. Dafinei, N. Di Marco, A. Fuss, C. Gotti, M. Mancuso, P. Martella, L. Pagnanini, G. Pessina, F. Petricca, S. Pirro, F. Pröbst, F. Reindl, K. Schäffner, J. Schieck, D. Schmiedmayer, C. Schwertner, R. Stadler, M. Stahlberg, V. Zema, Y. Zhu

    COSINUS (Cryogenic Observatory for SIgnatures seen in Next-generation Underground Searches) is an experiment employing cryogenic calorimeters, dedicated to direct dark matter search in underground laboratories. Its goal is to cross-check the annual modulation signal the DAMA collaboration has been detecting for about 20 years (Bernabei et al. in Nucl Part Phys Proc 303–305:74–79, 2018. https://doi

    更新日期:2020-05-02
  • Progress Report on the Large-Scale Polarization Explorer
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-04-17
    L. Lamagna, G. Addamo, P. A. R. Ade, C. Baccigalupi, A. M. Baldini, P. M. Battaglia, E. Battistelli, A. Baù, M. Bersanelli, M. Biasotti, C. Boragno, A. Boscaleri, B. Caccianiga, S. Caprioli, F. Cavaliere, F. Cei, K. A. Cleary, F. Columbro, G. Coppi, A. Coppolecchia, D. Corsini, F. Cuttaia, G. D’Alessandro, P. de Bernardis, G. De Gasperis, M. De Petris, F. Del Torto, V. Fafone, Z. Farooqui, F. Farsian

    The large-scale polarization explorer (LSPE) is a cosmology program for the measurement of large-scale curl-like features (B-modes) in the polarization of the cosmic microwave background. Its goal is to constrain the background of inflationary gravity waves traveling through the universe at the time of matter-radiation decoupling. The two instruments of LSPE are meant to synergically operate by covering

    更新日期:2020-04-18
  • Effects of Adding Transition Metal-Substituted Polyoxotungstates on the Frequency and Temperature-Dependent Dielectric Properties of (Bi 1.8 Pb 0.4 )Sr 2 Ca 2 Cu 3 O 10+δ Superconducting Phase
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-04-17
    Nour El Ghouch, Rami Al-Oweini, R. Awad

    In the search for highly responsive dielectric materials, superconducting samples of type (Bi,Pb)-2223 were prepared using the standard solid-state reaction technique, with the addition of three different concentrations of ferrato and mangano-undecatungstosilicate (0.04, 0.12, and 0.20 wt%). The dielectric studies were performed by measuring the parallel capacitance \(C_{p}\) as well as the dielectric

    更新日期:2020-04-18
  • Atomically Layered Helium Films at Ultralow Temperatures: Model Systems for Realizing Quantum Materials
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-04-13
    John Saunders, Brian Cowan, Jan Nyéki

    This year is also the 50th anniversary of the discovery of exfoliated graphite as a particularly uniform substrate (Thomy and Duval in J Chim Phys 66:1966, 1969. https://doi.org/10.1051/jcp/196966s21966, J Chim Phys 67:286, 1970. https://doi.org/10.1051/jcp/1970670286, J Chim Phys 67:1101, 1970. https://doi.org/10.1051/jcp/1970671101). In this article, we focus on the study of helium films on graphite-based

    更新日期:2020-04-18
  • Waveform Analysis of a 240-Pixel TES Array for X-Rays and Charged Particles Using a Function of Triggering Neighboring Pixels
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-04-13
    R. Hayakawa, S. Yamada, H. Tatsuno, J. W. Fowler, D. S. Swetz, D. A. Bennett, M. Durkin, G. C. O’Neil, J. N. Ullom, W. B. Doriese, C. D. Reintsema, J. D. Gard, S. Okada, T. Hashimoto, Y. Ichinohe, H. Noda, T. Hayashi

    A useful function, called group trigger, is implemented in a data acquisition system of a 240-pixel X-ray transition-edge sensor array to store simultaneous waveforms from any desired set of pixels. It works as a diagnostic tool which can record both primary pulses and associated crosstalk events with enough freedom to optimize the data output. Under a high rate of charged particle background, such

    更新日期:2020-04-18
  • GPU Supported Simulation of Transition-Edge Sensor Arrays
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-04-09
    M. Lorenz, C. Kirsch, P. E. Merino-Alonso, P. Peille, T. Dauser, E. Cucchetti, S. J. Smith, J. Wilms

    We present numerical simulations of full transition-edge sensor (TES) arrays utilizing graphical processing units (GPUs). With the support of GPUs, it is possible to perform simulations of large pixel arrays to assist detector development. Comparisons with TES small-signal and noise theory confirm the representativity of the simulated data. In order to demonstrate the capabilities of this approach

    更新日期:2020-04-18
  • Hyperspectral X-ray Imaging with TES Detectors for Nanoscale Chemical Speciation Mapping
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-04-07
    M. H. Carpenter, M. P. Croce, Z. K. Baker, E. R. Batista, M. P. Caffrey, C. J. Fontes, K. E. Koehler, S. E. Kossmann, K. G. McIntosh, M. W. Rabin, B. W. Renck, G. L. Wagner, M. P. Wilkerson, P. Yang, M. D. Yoho, J. N. Ullom, D. A. Bennett, G. C. O’Neil, C. D. Reintsema, D. R. Schmidt, G. C. Hilton, D. S. Swetz, D. T. Becker, J. D. Gard, J. Imrek, J. A. B. Mates, K. M. Morgan, D. Yan, A. L. Wessels

    We are developing an imaging capability (“Hyperspectral X-ray Imaging”) for mapping chemical information (molecular formula, phase, oxidation state, hydration) that is based on ultra-high-resolution X-ray emission spectroscopy with large transition-edge sensor microcalorimeter arrays in the scanning electron microscope. By combining microcalorimeter arrays with hundreds of pixels, high-bandwidth microwave

    更新日期:2020-04-18
  • Study of the Magnetocaloric Effect by Means of Theoretical Models in La 0.6 Ca 0.2 Na 0.2 MnO 3 Manganite Compound
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-04-07
    Bandar Alzahrani, Mohamed Hsini, Sobhi Hcini, Michel Boudard, Abdessalem Dhahri, Mohamed Lamjed Bouazizi

    In this work, an overview of the Weiss molecular mean-field theory, the Bean–Rodbell model and the Landau theory is presented, providing the theoretical background for simulating the magnetocaloric properties for La0.6Ca0.2Na0.2MnO3 manganite. Results showed that sample exhibits second-order ferromagnetic (FM)–paramagnetic (PM) magnetic phase transition and relatively higher values of magnetic entropy

    更新日期:2020-04-18
  • The Role of Multiple Fluctuation Events in NbN and NbTiN Superconducting Nanostrip Single-Photon Detectors
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-14
    L. Parlato, D. Salvoni, M. Ejrnaes, D. Massarotti, R. Caruso, R. Satariano, F. Tafuri, X. Y. Yang, L. You, Z. Wang, G. P. Pepe, R. Cristiano

    We report on measurements of the switching current distributions on two-dimensional NbN superconducting nanostrip single-photon detectors (SNSPD), 5 nm thick and 80 nm wide, in an interval of temperatures from 6 K down to 0.3 K and compare the data with those obtained for similar NbTiN nanostrips. The standard deviations of the switching distributions show an extended region at high temperatures where

    更新日期:2020-04-18
  • The Phonon-Mediated TES Cosmic Ray Detector for Focal Plane of ATHENA X-Ray Telescope
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-01-27
    M. Biasotti, C. Boragno, L. Ferrari Barusso, F. Gatti, D. Grosso, M. Rigano, B. Siri, C. Macculi, M. D’Andrea, L. Piro

    The current projects of future X-rays space telescopes foresee high resolving power transition edge sensor (TES) micro-calorimeters arrays as focal plane instrument. In order to full exploit their sensitivity in the space environment, they need an anticoincidence detector to reject the background due to cosmic charged particles. High-energy protons (> 150 MeV) and other charged particle may release

    更新日期:2020-04-18
  • The Demonstration Model of the ATHENA X-IFU Cryogenic AntiCoincidence Detector
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2019-12-20
    M. D’Andrea, C. Macculi, G. Torrioli, A. Argan, D. Brienza, S. Lotti, G. Minervini, L. Piro, M. Biasotti, L. Ferrari Barusso, F. Gatti, M. Rigano, A. Volpe, E. S. Battistelli

    The Cryogenic AntiCoincidence detector (CryoAC) of ATHENA X-IFU is designed to reduce the particle background of the instrument and to enable the mission science goals. It is a 4-pixel silicon microcalorimeter sensed by an Ir/Au TES network. We have developed the CryoAC demonstration model, a prototype aimed to probe the critical technologies of the detector, i.e., the suspended absorber with an active

    更新日期:2020-04-18
  • The CUORE Data Acquisition System
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2019-12-09
    S. Copello, S. Di Domizio, A. Branca, A. Caminata, L. Canonica, A. Giachero, E. Guardincerri, L. Marini, M. Pallavicini, M. Vignati

    Large mass bolometers, thanks to their good energy resolution and high radiopurity, can be used for rare event searches, such as neutrinoless double beta decay or dark matter direct detection. The bolometric technique has been adopted by the CUORE experiment which is composed by an array of 988 tellurium dioxide bolometers with a total active mass of 741 kg. The experiment started taking data in April

    更新日期:2020-04-18
  • Improving Energy Detection Efficiency of Ti-Based Superconducting Transition-Edge Sensors with Optical Cavity
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-13
    Y. Geng, W. Zhang, P. Z. Li, J. Q. Zhong, Z. Wang, W. Miao, Y. Ren, J. F. Wang, Q. J. Yao, S. C. Shi

    Superconducting transition-edge sensors (TESs) have demonstrated high detection efficiency and photon-number-resolving capability, making TESs attractive in quantum information and astrophysics. Aiming to achieve high energy detection efficiency (i.e., the ratio of the detected energy to incident energy), we integrate the TES in an optical cavity, consisting of 16-layer dielectric reflection mirror

    更新日期:2020-04-18
  • Ti Hot Electron Bolometers with Johnson Noise Readout for Terahertz Radiation Detection
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-28
    H. Gao, W. Miao, Z. Wang, W. Zhang, Y. Ren, K. M. Zhou, J. Q. Zhong, S. C. Shi

    A hot electron bolometer (HEB) with Johnson noise readout is an attractive technique for radiation detection due to its high sensitivity, wide operating temperature range, and large dynamic range. In this paper, we present the development of a terahertz HEB based on Johnson noise readout. The HEB consists of a titanium microbridge connected to two high-energy-gap niobium contacts for confining hot

    更新日期:2020-04-18
  • On-Wafer Cryogenic Characterization Technique of an SIS-Based Frequency Up and Down Converter
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-03-07
    Takafumi Kojima, Yoshinori Uzawa, Wenlei Shan, Yuto Kozuki

    This paper describes an on-wafer characterization system and calibration technique for frequency up and down converters based on a superconductor–insulator–superconductor (SIS) tunnel junction. The measurement system uses a 4-K probe station in combination with a vector network analyzer which allows measurement of both up- and down-conversion gains and reflection coefficients. We employed and verified

    更新日期:2020-04-18
  • Development of an Optical Transition-Edge Sensor Array
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-10
    Toshio Konno, Sachiko Takasu, Kaori Hattori, Daiji Fukuda

    Transition-edge sensors (TESs) exhibiting high energy resolution for single optical photons have been applied to photon-counting microscopy for biological imaging. This paper discusses the development of TES arrays with large effective areas to expand the field of view of photon-counting microscopy and has fabricated an optical TES array comprising a Ti/Au bilayer on a Si substrate. Thermal interference

    更新日期:2020-04-18
  • ECLIPSE, the Cryogenic Readout Circuit of the Polarimetric Camera B-BOP for the SPICA Space Observatory Project
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-01
    Xavier de la Broïse, Olivier Gevin

    We have designed ECLIPSE, the readout circuit of the space infrared observatory project SPICA and its instrument B-BOP. When coupled to a 16 × 16 pixel detector matrix, the circuit fulfils two functions: an initial “amplification” stage (buffering) at input, and a subsequent 16 to 1 time multiplexing of the detector readout. Since it is placed directly above the detector and consequently needs to operate

    更新日期:2020-04-18
  • Fabrication of OMT-Coupled Kinetic Inductance Detector for CMB Detection
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-01-29
    Q. Y. Tang, P. S. Barry, T. W. Cecil, E. Shirokoff

    Future cosmic microwave background (CMB) experiments, including the large scale ground-based Stage Four CMB Experiment (CMB-S4), satellites, and balloons, aim to map the CMB to an unprecedented precision in order to answer several key questions in cosmology. However, to reach the target noise sensitivity, more than 100,000 detectors will be needed. Arrays of kinetic inductance detectors (KIDs) are

    更新日期:2020-04-18
  • Proximity-Coupled Al/Au Bilayer Kinetic Inductance Detectors
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-01-07
    Jie Hu, Maria Salatino, Alessandro Traini, Christine Chaumont, Faouzi Boussaha, Christophe Goupil, Michel Piat

    This paper mainly discusses the fabrication and characterization of proximity-coupled Al/Au bilayer kinetic inductance detectors (KIDs). The proximity effect is used to optimize the critical temperature of the superconducting film and to increase the kinetic inductance fraction of the film. An Al/Au bilayer with thickness equal to 30 nm and 10 nm, respectively, is evaporated on a silicon substrate

    更新日期:2020-04-18
  • Sensitivity of the Prime-Cam Instrument on the CCAT-Prime Telescope
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-03-30
    S. K. Choi, J. Austermann, K. Basu, N. Battaglia, F. Bertoldi, D. T. Chung, N. F. Cothard, S. Duff, C. J. Duell, P. A. Gallardo, J. Gao, T. Herter, J. Hubmayr, M. D. Niemack, T. Nikola, D. Riechers, K. Rossi, G. J. Stacey, J. R. Stevens, E. M. Vavagiakis, M. Vissers, S. Walker

    CCAT-prime is a new 6 m crossed Dragone telescope designed to characterize the cosmic microwave background (CMB) polarization and foregrounds, measure the Sunyaev–Zel’dovich effects of galaxy clusters, map the [CII] emission intensity from the epoch of reionization (EoR), and monitor accretion luminosity over multiyear timescales of hundreds of protostars in the Milky Way. CCAT-prime will make observations

    更新日期:2020-03-30
  • Investigation on Wicking Performance of Cryogenic Propellants Within Woven Screens Under Different Thermal and Gravity Conditions
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-03-27
    Yuan Ma, Yanzhong Li, Fushou Xie, Jian Li, Lei Wang

    In order to investigate the wicking performance of cryogenic propellants within metallic screens for space liquid acquisition devices, a modified one-dimensional macroscopic model is introduced. The model is successfully verified by the experimental data of both isothermal and superheated wicking. Dutch twill weave 200 × 1400 in the warp direction is chosen as the screen object. Three cryogenic propellants

    更新日期:2020-03-27
  • Progress and Challenges of Sub-Kelvin Sorption Cooler and Its Prospects for Space Application
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-03-25
    Xiaotong Xi, Jue Wang, Liubiao Chen, Yuan Zhou, Junjie Wang

    The helium sorption cooler plays an important role in both ground and space application because it does not require a magnetic field and is not dependent on gravity. At present, one research focus of sorption cooler is the development of multistage to overcome the disadvantages of the originally developed single-stage structure. The other focus is the development of continuous sorption cooler. Although

    更新日期:2020-03-25
  • Quantum Tunneling in the $$\alpha -T_3$$α-T3 Model with an Effective Mass Term
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-03-25
    Xin Ye, Sha-Sha Ke, Xin-Wei Du, Yong Guo, Hai-Feng Lü

    We investigate the quantum tunneling properties through a square potential barrier in the \(\alpha -T_3\) model with an effective mass term. The additional mass term can be induced by the effective magnetic field or the site energy difference on different sublattices, in which the flat band is located at the center or edge of the band gap band, respectively. The linear dispersion in the \(\alpha -T_3\)

    更新日期:2020-03-25
  • The Superconductivity Mechanism in Nd-1111 Iron-Based Superconductor Doped by Calcium
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-03-25
    F. Shahbaz Tehrani, V. Daadmehr

    We describe the effect of nonmagnetic impurity on the superconductivity behavior of the NdFeAsO0.8F0.2 iron-based superconductor. The resistivity measurements show that the superconductivity is suppressed upon increasing the low amounts of calcium impurity (x ≤ 0.05). Also, the TC decreases with the increase in the residual resistivity. Such behavior is qualitatively described by the Abrikosov–Gorkov

    更新日期:2020-03-25
  • Low-Lying Collective Modes of a One-Dimensional Bose Gas with Quantum Fluctuation Effect
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-03-18
    Zhao-Hui Wang, Ji-Xuan Hou

    We theoretically investigate the collective excitations of a one-dimensional Bose–Einstein condensate with both interparticle interaction and quantum fluctuation effect in an anharmonic trap. We derive the coupled equations of motions for the center-of-mass coordinate of the condensate and its width by using variational approaches. We find a reentrant behavior of the breathing mode and demonstrate

    更新日期:2020-03-18
  • A Composite Phononic Crystal Design for Quasiparticle Lifetime Enhancement in Kinetic Inductance Detectors
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-03-12
    T. A. Puurtinen, K. Rostem, P. J. de Visser, I. J. Maasilta

    A nanoscale phononic crystal filter (reflector) is designed for a kinetic inductance detector where the reflection band is matched to the quasiparticle recombination phonons with the aim to increase quasiparticle lifetime in the superconducting resonator. The inductor is enclosed by a 1-μm-wide phononic crystal membrane section with two simple hole patterns that each contain a partial spectral gap

    更新日期:2020-03-12
  • Performance of Adiabatic Melting as a Method to Pursue the Lowest Possible Temperature in $$^{3}\hbox {He}$$3He and $$^{3}\hbox {He}$$3He – $$^{4}\hbox {He}$$4He Mixture at the $$^{4}\hbox {He}$$4He Crystallization Pressure
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-03-11
    T. S. Riekki, A. P. Sebedash, J. T. Tuoriniemi

    We studied a novel cooling method, in which \(^{3}\hbox {He}\) and \(^{4}\hbox {He}\) are mixed at the \(^{4}\hbox {He}\) crystallization pressure at temperatures below \(0.5\,\mathrm {mK}\). We describe the experimental setup in detail and present an analysis of its performance under varying isotope contents, temperatures, and operational modes. Further, we developed a computational model of the system

    更新日期:2020-03-11
  • Study of TES Detector Transition Curve to Optimize the Pixel Design for Frequency-Division Multiplexing Readout
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-03-07
    M. L. Ridder, K. Nagayoshi, M. P. Bruijn, L. Gottardi, E. Taralli, P. Khosropanah, H. Akamatsu, J. van der Kuur, K. Ravensberg, S. Visser, A. C. T. Nieuwenhuizen, J. R. Gao, J.-W. den Herder

    Superconducting transition-edge sensors (TESs) are highly sensitive detectors. Based on the outstanding performance on spectral resolution, the X-ray integral field unit (X-IFU) instrument on-board athena will be equipped with a large array of TES-based microcalorimeters. For optimal performance in terms of the energy resolution, it is essential to limit undesirable nonlinearity effects in the TES

    更新日期:2020-03-07
  • Superconductor-Ferromagnet Tunnel Junction Thermoelectric Bolometer and Calorimeter with a SQUID Readout
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-03-07
    Z. Geng, A. P. Helenius, T. T. Heikkilä, I. J. Maasilta

    The superconductor-ferromagnet thermoelectric detector (SFTED) is a novel ultrasensitive radiation detector based on the giant thermoelectric effect in superconductor-ferromagnet tunnel junctions. This type of detector can be operated without the need of additional bias lines and is predicted to provide a performance rivaling transition-edge sensors and kinetic inductance detectors. Here, we report

    更新日期:2020-03-07
  • AC Conduction Mechanism in (Cu) x /(CuTl)-1223 Nanoparticles–Superconductor Composites
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-03-05
    Abrar A. Khan, M. Mumtaz, Liaqat Ali, Mubasher, Y. Slimani, M. Nasir Khan, Irfan Qasim

    Copper (Cu) nanoparticles (NPs) were prepared by sol–gel process, and superconducting (Cu0.5Tl0.5)Ba2Ca2Cu3O10−δ {(CuTl)-1223} phase was synthesized by conventional solid-state reaction. The desired (Cu)x/(CuTl)-1223, x = 0–4.0 wt% composites, were obtained by adding Cu NPs in superconducting (CuTl)-1223 phase. These composites were characterized by X-ray diffraction, DC-resistivity versus temperature

    更新日期:2020-03-05
  • Vortices in Bose–Einstein Condensates with Random Depth Optical Lattice
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-28
    Pan Hu, Qiang Gu

    Effects of random depth optical lattice (OL) on vortices in Bose–Einstein condensates (BECs) are studied. By numerically solving Gross–Pitaevskii equation for rotating BECs, we analyzed the property of a single vortex (slow rotating) and vortex lattice structures (fast rotating) in the presence of random depth optical lattice. It is shown that similar to speckle disorder and bichromatic optical lattice

    更新日期:2020-02-28
  • Performance Parameters Prediction for FPFD Miniature Stirling Cryocooler Considering Polytropic Processes
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-26
    Radhey Sham, Tejinder Kumar Jindal, Rajesh Kumar Saluja, Vineet Kumar

    The performance of an actual free piston free displacer (FPFD) Stirling miniature cryocooler has been simulated based on the parameters affecting the performance of the cryocooler. The processes of compression and expansion in the cryocooler have been assumed to be polytropic with variable ratio of specific heats for the working fluid, i.e., helium. The effect of design parameters like piston spring

    更新日期:2020-02-26
  • BULLKID: BULky and Low-Threshold Kinetic Inductance Detectors
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-24
    I. Colantoni, C. Bellenghi, M. Calvo, R. Camattari, L. Cardani, N. Casali, A. Cruciani, S. Di Domizio, J. Goupy, V. Guidi, H. Le Sueur, M. Martinez, A. Mazzolari, A. Monfardini, V. Pettinacci, G. Pettinari, M. Romagnoni, M. Vignati

    BULLKID is an R&D project on a cryogenic particle detector to search for rare low-energy processes such as low-mass dark matter and neutrino coherent scattering off nuclei. The detector unit we are designing consists in an array of ~ 100 silicon absorbers sensed by phonon-mediated, microwave-multiplexed kinetic inductance detectors, with energy threshold below 100 eV and total target mass around 30 g

    更新日期:2020-02-24
  • Microcalorimetry of Carbon Ion Beam for Medical Treatment by Transition Edge Sensor
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-24
    Ryan Smith, Masashi Ohno, Yoshitaka Miura, Naoki Nakada, Yuki Mitsuya, Hiroyuki Takahashi, Tokihiro Ikeda, Chico Otani, Makoto Sakama, Naruhiro Matsufuji, Tomoya Irimatsugawa, Satoshi Kohjiro, Hirotake Yamamori, Fuminori Hirayama

    We have measured the energy of each charged particle in carbon ion beam using a transition edge sensor (TES). The TES was irradiated by carbon ion beam of 100 MeV/u in Heavy Ion Medical Accelerator in Chiba. We have measured the energy of each charged particle in the carbon ion beam. This will contribute to the establishment of a new dosimetry method of carbon ion beam for radiotherapy.

    更新日期:2020-02-24
  • Transformer-Coupled TES Frequency Domain Readout Prototype
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-24
    M. Rouble, M. Dobbs, A. Gilbert, J. Montgomery, G. Noble, C. Vergès

    Frequency-domain multiplexing (fMUX) is a mature readout scheme for transition edge sensor (TES) detectors in the millimetre and sub-millimetre bands. It is implemented at MHz carrier frequencies for the South Pole Telescope, POLARBEAR, and Simons Array and is planned for deployment on the LiteBIRD space polarimeter. The existing implementations couple to the detectors with low-noise, low-input-impedance

    更新日期:2020-02-24
  • Characterizing the Sensitivity of 40 GHz TES Bolometers for BICEP Array
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-24
    C. Zhang, P. A. R. Ade, Z. Ahmed, M. Amiri, D. Barkats, R. Basu Thakur, C. A. Bischoff, J. J. Bock, H. Boenish, E. Bullock, V. Buza, J. Cheshire, J. Connors, J. Cornelison, M. Crumrine, A. Cukierman, M. Dierickx, L. Duband, S. Fatigoni, J. P. Filippini, G. Hall, M. Halpern, S. Harrison, S. Henderson, S. R. Hildebrandt, G. C. Hilton, H. Hui, K. D. Irwin, J. Kang, K. S. Karkare, E. Karpel, S. Kefeli

    The BICEP/Keck (BK) experiment aims to detect the imprint of primordial gravitational waves in the cosmic microwave background polarization, which would be direct evidence of the inflation theory. While the tensor-to-scalar ratio has been constrained to be \(r_{0.05}<0.06\) at 95% c.l., further improvements on this upper limit are hindered by polarized galactic foreground emissions and removal of gravitational

    更新日期:2020-02-24
  • Full-Array Noise Performance of Deployment-Grade SuperSpec mm-Wave On-Chip Spectrometers
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-24
    K. S. Karkare, P. S. Barry, C. M. Bradford, S. Chapman, S. Doyle, J. Glenn, S. Gordon, S. Hailey-Dunsheath, R. M. J. Janssen, A. Kovács, H. G. LeDuc, P. Mauskopf, R. McGeehan, J. Redford, E. Shirokoff, C. Tucker, J. Wheeler, J. Zmuidzinas

    SuperSpec is an on-chip filter bank spectrometer designed for wideband moderate-resolution spectroscopy at millimeter wavelengths, employing TiN kinetic inductance detectors. SuperSpec technology will enable large-format spectroscopic integral field units suitable for high-redshift line intensity mapping and multi-object spectrographs. In previous results, we have demonstrated noise performance in

    更新日期:2020-02-24
  • A Closed-Cycle Miniature Dilution Refrigerator for a Fast-Cooldown 100 mK Detector Wafer Test Cryostat
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-24
    S. Azzoni, A. J. May, S. T. Chase, G. Coppi, L. C. Kenny, S. J. Melhuish, L. Piccirillo, A. Suzuki, J. Wenninger

    The forthcoming generation of cosmic microwave background polarization observatories is developing large format detector arrays which will operate at 100 mK. Given the volume of detector wafers that will be required, fast-cooldown 100 mK test cryostats are increasingly needed. A miniature dilution refrigerator (MDR) has been developed for this purpose and is reported. The MDR is precooled by a double-stage

    更新日期:2020-02-24
  • SQUID Noise in a 176-Pixel FDM Demonstrator for the SAFARI Far-Infrared Spectrometer
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-17
    Michael D. Audley, Qian Wang, Richard A. Hijmering, Pourya Khosropanah, Gert de Lange, Anton J. van der Linden, Marcel L. Ridder, Emanuele Taralli

    We are developing the frequency-domain multiplexing (FDM) readout for the SAFARI far-infrared spectrometer on board the SPICA space observatory. Each readout channel comprises a set of ~ 160 TESs and LC filters and is read out with a SQUID preamplifier. Baseband feedback is applied to overcome the dynamic range limitations of the SQUID. We have carried out extensive characterization of a test readout

    更新日期:2020-02-17
  • Pulse Tube Cryocooler: Phasor Analysis and One-Dimensional Numerical Simulation
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-13
    N. Almtireen, J. J. Brandner, J. G. Korvink

    An analysis of the detailed operation for the tube element is proposed for an orifice pulse tube cryocooler. This is achieved through phasor analysis using basic thermodynamic relations to estimate the approximated cooling power associated with this machine. Moreover, the effect of the phase shift angle is illustrated by forming an analogy between the phase shift mechanism and a series RLC circuit

    更新日期:2020-02-13
  • LiteBIRD Cryogenic Chain: 100 mK Cooling with Mechanical Coolers and ADRs
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-13
    Jean-Marc Duval, Thomas Prouvé, Peter Shirron, Keisuke Shinozaki, Yutaro Sekimoto, Takashi Hasebe, Gerard Vermeulen, Jérome André, Masashi Hasumi, Ludovic Montier, Baptiste Mot

    LiteBIRD is a JAXA-led L-Class mission aimed at the study of B-mode polarization of the cosmic microwave background. Measurements on 15 bandwidth from 34 to 448 GHz are made on two instruments, low-frequency telescope and medium- and high-frequency telescope. To reach the desired sensitivities, more than 4500 transition edge sensors detectors, used on both instruments, will be continuously cooled to

    更新日期:2020-02-13
  • Theoretical Prediction of Thermodynamic Functions of TiC: Morse Ring-Shaped Potential
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-10
    R. Khordad, A. Ghanbari

    In this work, we theoretically predict thermodynamic properties of titanium carbide (TiC). To this end, we have analytically solved the Schrödinger equation with the Morse ring-shaped potential using Pekeris approximation. We have obtained energy eigenvalues for the potential using the generalized parametric Nikiforov–Uvarov (UV) procedure. Using the obtained energy eigenvalues, we could analytically

    更新日期:2020-02-10
  • Operation of a Diamond Cryogenic Detector for Low-Mass Dark Matter Searches
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-02-01
    L. Canonica, A. H. Abdelhameed, P. Bauer, A. Bento, E. Bertoldo, N. Ferreiro Iachellini, D. Fuchs, D. Hauff, M. Mancuso, F. Petricca, F. Pröbst, J. Rothe

    Despite the multiple and convincing evidence of the existence of dark matter (DM) in our Universe, its detection is one of the most pressing questions in particle physics. As of today, there is no unambiguous hint which could clarify the particle nature of DM. For these reasons, a huge experimental effort is ongoing, trying to realize experiments which can probe the particle properties of DM. In particular

    更新日期:2020-02-01
  • Updated Design of the CMB Polarization Experiment Satellite LiteBIRD
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-01-27
    H. Sugai, P. A. R. Ade, Y. Akiba, D. Alonso, K. Arnold, J. Aumont, J. Austermann, C. Baccigalupi, A. J. Banday, R. Banerji, R. B. Barreiro, S. Basak, J. Beall, S. Beckman, M. Bersanelli, J. Borrill, F. Boulanger, M. L. Brown, M. Bucher, A. Buzzelli, E. Calabrese, F. J. Casas, A. Challinor, V. Chan, Y. Chinone, J.-F. Cliche, F. Columbro, A. Cukierman, D. Curtis, P. Danto, P. de Bernardis, T. de Haan

    Recent developments of transition-edge sensors (TESs), based on extensive experience in ground-based experiments, have been making the sensor techniques mature enough for their application on future satellite cosmic microwave background (CMB) polarization experiments. LiteBIRD is in the most advanced phase among such future satellites, targeting its launch in Japanese Fiscal Year 2027 (2027FY) with

    更新日期:2020-01-27
  • Noise Measurements of a Low-Noise Amplifier in the FDM Readout System for SAFARI
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-01-24
    Qian Wang, Michael D. Audley, Pourya Khosropanah, Jan van der Kuur, Gert de Lange, Amin Aminaei, Dick Boersma, Floris van der Tak, Jian-Rong Gao

    The SPICA-SAFARI instrument requires extremely sensitive transition edge sensor (TES) arrays with a noise equivalent power of \(2 \times 10^{ - 19} \;{\text{W/}}\sqrt {\text{Hz}}\) and a readout system with an output noise that is dominated by the detector noise. It is essential to ensure the frequency domain multiplexing (FDM) readout system in SAFARI meets the noise requirement. The FDM system in

    更新日期:2020-01-24
  • Thermal Crosstalk Measurements and Simulations for an X-ray Microcalorimeter Array
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2020-01-18
    Antoine R. Miniussi, Joseph S. Adams, Simon R. Bandler, Sophie Beaumont, Meng P. Chang, James A. Chervenak, Fred M. Finkbeiner, Jong Y. Ha, Ruslan Hummatov, Richard L. Kelley, Caroline A. Kilbourne, Frederick S. Porter, John E. Sadleir, Kazuhiro Sakai, Stephen J. Smith, Nicholas A. Wakeham, Edward J. Wassell

    Arrays of high-density microcalorimeters require careful heat sinking in order to minimize the thermal crosstalk between nearby pixels. For the array of microcalorimeters developed for the Athena X-ray Integral Field Unit instrument, which has more than 3000 pixels on a 275 µm pitch, it is essential to address this problem in order to meet the energy-resolution requirements. The instrument’s energy-resolution

    更新日期:2020-01-18
  • Microwave Multiplexing on the Keck Array
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2019-12-17
    A. Cukierman, Z. Ahmed, S. Henderson, E. Young, C. Yu, D. Barkats, D. Brown, S. Chaudhuri, J. Cornelison, J. M. D’Ewart, M. Dierickx, B. J. Dober, J. Dusatko, S. Fatigoni, J. P. Filippini, J. C. Frisch, G. Haller, M. Halpern, G. C. Hilton, J. Hubmayr, K. D. Irwin, K. S. Karkare, E. Karpel, S. A. Kernasovskiy, J. M. Kovac, A. Kovacs, S. E. Kuenstner, C. L. Kuo, D. Li, J. A. B. Mates, S. Smith, T. St

    We describe an on-sky demonstration of a microwave-multiplexing readout system in one of the receivers of the Keck Array, a polarimetry experiment observing the cosmic microwave background at the South Pole. During the austral summer of 2018–2019, we replaced the time-division multiplexing readout system with microwave-multiplexing components including superconducting microwave resonators coupled to

    更新日期:2019-12-17
  • $$\hbox {Li}_2\hbox {MoO}_4$$Li2MoO4 Phonon–Scintillation Detection Systems with MMC Readout
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2019-12-10
    H. L. Kim, H. J. Kim, I. Kim, S. R. Kim, Y. D. Kim, Y. H. Kim, D. H. Kwon, J. A. Jeon, M. H. Lee, M. K. Lee, J. H. So

    We developed measurement systems for the simultaneous detection of phonon and scintillation signals from \(\hbox {Li}_2\hbox {MoO}_4\) crystals based on the metallic magnetic calorimeter (MMC) technology. Two measurements were carried out using \(\hbox {Li}_2\hbox {MoO}_4\) crystals of different sizes. The first measurement was conducted with a compact detection system designed for a \(1\times 1\times

    更新日期:2019-12-10
  • Development of a Ti/Au TES Microcalorimeter Array as a Backup Sensor for the Athena/X-IFU Instrument
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2019-12-09
    K. Nagayoshi, M. L. Ridder, M. P. Bruijn, L. Gottardi, E. Taralli, P. Khosropanah, H. Akamatsu, S. Visser, J.-R. Gao

    We are developing a transition edge sensor (TES) microcalorimeter array based on a Ti/Au superconducting bilayer, as a backup option for the X-IFU instrument on the Athena X-ray observatory. The array is read out by a frequency-division multiplexing readout system using a 1–5 MHz frequency band. Extensive research collaborations between NASA/Goddard and SRON have led to new design rules for microcalorimeters

    更新日期:2019-12-09
  • High-Resolution Digitization System for the CROSS Experiment
    J. Low. Temp. Phys. (IF 1.491) Pub Date : 2019-11-11
    P. Carniti, C. Gotti, G. Pessina

    The signal digitization for CROSS, a bolometric experiment for the search of neutrinoless double beta decay at LSC—Canfranc Underground Laboratory, will be based on a custom solution comprised of an analog-to-digital board interfaced to an Altera Cyclone V FPGA module. Each analog-to-digital board hosts 12 channels that allow data digitization up to 25 ksps per channel and an effective resolution of

    更新日期:2019-11-11
  • Fabrication of Flexible Superconducting Wiring with High Current-Carrying Capacity Indium Interconnects.
    J. Low. Temp. Phys. Pub Date : 2019-07-31
    N S DeNigris,J A Chervenak,S R Bandler,M P Chang,N P Costen,M E Eckart,J Y Ha,C A Kilbourne,S J Smith

    The X-ray integral field unit (X-IFU) is a cryogenic spectrometer for the Advanced Telescope for High ENergy Astrophysics (ATHENA). ATHENA is a planned next-generation space-based X-ray observatory with capabilities that surpass the spectral resolution of prior missions. Proposed device designs contain up to 3840 transition edge sensors, each acting as an individual pixel on the detector, presenting

    更新日期:2019-11-01
Contents have been reproduced by permission of the publishers.
导出
全部期刊列表>>
智控未来
聚焦商业经济政治法律
跟Nature、Science文章学绘图
控制与机器人
招募海内外科研人才,上自然官网
隐藏1h前已浏览文章
课题组网站
新版X-MOL期刊搜索和高级搜索功能介绍
ACS材料视界
x-mol收录
湖南大学化学化工学院刘松
上海有机所
廖良生
南方科技大学
西湖大学
伊利诺伊大学香槟分校
徐明华
中山大学化学工程与技术学院
试剂库存
天合科研
down
wechat
bug