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  • Self-diffusion of Liquid Hydrogen: A Quasi-elastic Neutron Scattering Study
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-08-11
    Timothy R. Prisk, Scott Hanna, Richard T. Azuah

    We present quasi-elastic neutron scattering measurements of liquid normal hydrogen under saturated vapor pressure. Empirical estimates of the self-diffusion constant are generally in good agreement with previous nuclear magnetic resonance studies. We consider available theoretical calculations of the transport properties of liquid hydrogen as well as the applicability of the Stokes–Einstein relation

  • Noise Temperature Measurements for Axion Haloscope Experiments at IBS/CAPP
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-08-07
    S. W. Youn, E. Sala, J. Jeong, J. Kim, Y. K. Semertzidis

    The axion was first introduced as a consequence of the Peccei-Quinn mechanism to solve the CP problem in strong interactions of particle physics and is a well-motivated cold dark matter candidate. This particle is expected to interact extremely weakly with matter, and its mass is expected to lie in \(\upmu\)eV range with the corresponding frequency roughly in GHz range. In 1983, P. Sikivie proposed

  • First-Principle and Monte Carlo Calculations of Structural, Electronic and Magnetic Properties of the Double Perovskite Sr 2 TiMoO 6
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-08-06
    S. Amraoui, A. Feraoun, M. Kerouad

    Based on the density functional theory and the Monte Carlo Simulation (MCS), the structural, the electronic and the magnetic properties of \(\hbox {Sr}_{2}\hbox {TiMoO}_6\) double perovskite have been studied with (GGA), \((\hbox {GGA}+U)\) and \((\hbox {GGA}+U+\hbox {SOC})\) approaches. The lattice parameter, the band structure and the electronic densities of states have been analyzed. Furthermore

  • Generating a Nonclassical Thermal State Via Number Operators
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-08-06
    Gang Ren, Jian-ming Du, Hai-jun Yu, Wen-hai Zhang

    We study a nonclassical thermal state by repeatedly operating the number operator on normal thermal state. Then, we investigate the nonclassical features of this state according to the P-function, photon-number distribution, Mandel’s Q-parameter, second-order correlation function and negative Wigner distribution as well as squeezing properties. Our results show that this state presents nonclassical

  • New Gd4-6-10 and Gd5-7-12 Cuprate Superconductors
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-08-06
    G. I. Supelano, D. Martinez Buitrago, J. A. Mejía Gómez, C. A. Parra Vargas, J. Albino Aguiar

    This paper describes the Gdx−2BaxCu2x−2Oδ (x = 6, 7) cuprate system synthesis using the conventional solid-state reaction method. Rietveld analysis of X-ray patterns evidences that samples crystallize in Pmm2 (#25) space group at room temperature with lattice parameter a = 3.8807 Å, b = 3.8735 Å, c = 38.7094 Å for Gd4Ba6Cu10Oδ and a = 3.8680 Å, b = 3.8763 Å, c = 46.5065 for Gd5Ba7Cu12Oδ. Resistivity

  • Critical Exponent Analysis and Evidence of Long-Range Ferromagnetic Order in Lightly Pr-Doped Nanocrystalline (La 1-x Pr x ) 0.67 Ba 0.33 MnO 3 ( x = 0.15 and 0.22) Manganites
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-08-04
    Ma. Oumezzine, E. K. Hlil

    We investigate the effect of lightly Pr3+ doping ions on the critical behavior of (La1-xPrx)0.67Ba0.33MnO3 (x = 0.15–0.22) perovskite synthesized by the modified sol–gel Pechini method. The obtained critical exponents (beta, gamma and delta) have been investigated by measuring the magnetization around the Curie temperature, TC. Based on the modified Arrott plot and Kouvel–Fisher techniques, scaling

  • Effect of Ru Substitution on the Superconducting Properties of GdBa 2 (Cu 3−x Ru x )O 7−δ ( x = 0 to 0.2)
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-07-28
    A. Nur-Amelia, R. Abd-Shukor

    The effect of Ru substitution on GdBa2Cu3O7−δ (Gd123) superconductor was investigated. Polycrystalline samples with starting composition GdBa2(Cu3−xRux)O7−δ (x = 0 to 0.2) were prepared using the solid-state reaction method. X-rays diffraction (XRD) patterns showed the presence of Gd123 peaks in all samples. An impurity phase, Ba(Gd0.5Ru0.5)O3 was observed in the Ru substituted samples. Scanning electron

  • Vortices Formed by Two Counter-Propagating Waves for Surface Phonon Polaritons with Material Losses
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-07-26
    Hyoung-In Lee, Jinsik Mok

    We examine the surface phonon polaritons established on resonance between lossy silicon carbide and vacuum over the Reststrahlen frequency range. To this goal, we investigate two waves counter-propagating along a planar material interface in terms of the orbital and spin parts of the Poynting vector. Vortices of the spin part are thus found to be generated near the collision point of the two waves

  • Dimensional Crossover in the Bose–Einstein Condensation Confined to Anisotropic Three-Dimensional Lattices
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-07-25
    K. K. Witkowski, T. K. Kopeć

    The Bose–Einstein condensation (BEC) in three-dimensional (3D) anisotropic lattices is studied. We present theoretical results for the critical temperature for BEC, chemical potential, condensate fraction and relevant thermodynamic quantities like: internal energy, entropy, specific heat and compressibility as a function of anisotropy parameter being the ratio of the nearest-neighbor in-plane (\(t_\parallel\))

  • Reducing the Susceptibility of Lumped-Element KIDs to Two-Level System Effects
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-07-23
    A. L. Hornsby, P. S. Barry, S. M. Doyle, Q. Y. Tang, E. Shirokoff

    Arrays of lumped-element kinetic inductance detectors (LEKIDs) optically coupled through an antenna-coupled transmission line are a promising candidate for future cosmic microwave background experiments. However, the dielectric materials used for the microstrip architecture are known to degrade the performance of superconducting resonators. In this paper, we investigate the feasibility of microstrip

  • Approach to Solving Quasiclassical Equations with Gauge Invariance
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-07-22
    Priya Sharma

    Quasiclassical equations with manifest gauge invariance are discussed in the context of unconventional singlet superconducting states in the static limit. Deviations of the quasiclassical propagator from its equilibrium solutions in the presence of magnetic fields and Hall terms are analysed in terms of a “small” parameter and a formulation developed to first order in “small”. A modified quasiclassical

  • Spatio-Temporal Spreading of Correlations in the Bose–Hubbard Model
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-07-21
    Malcolm P. Kennett, Matthew R. C. Fitzpatrick

    We have developed a formalism that allows the study of correlations in space and time in the Bose–Hubbard model, both in equilibrium and out of equilibrium. We obtain a two-particle irreducible effective action in the contour-time formalism that allows us to obtain equations of motion for the superfluid order parameter and two-point correlation functions. We use these equations to calculate equilibrium

  • Cryogenic Light Detectors for Background Suppression: The CALDER Project
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-07-21
    N. Casali, C. Bellenghi, M. Calvo, L. Cardani, G. Castellano, I. Colantoni, C. Cosmelli, A. Cruciani, S. Di Domizio, J. Goupy, M. Martinez, A. Monfardini, G. Pettinari, H. le Sueur, M. Vignati

    The CALDER project aims to realize cryogenic light detectors for the next generation of experiments searching for rare events. More in detail, the main application of these devices will be the background suppression in future cryogenic calorimetric experiments searching for neutrinoless double beta decay (\(0\nu \)DBD). This is the case of CUPID, a next-generation \(0\nu \)DBD observatory, able to

  • Tunable Second Harmonic Generation in Antiferromagnetic Photonic Crystal with Graphene
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-07-20
    Bai Lu, Sheng Zhou, Hong Liang, Qiang Zhang, Yutian Zhao, Shufang Fu

    The generation of second harmonic (SH) in the structure (SiO2/MnF2/graphene)N/ZrO2 has been investigated with the matrix transfer method. The theoretical simulation results show that the effect of the graphene (Gr) on SH outputs above or below the surface is obvious. The SH outputs compared with the same structure only without the Gr layer are greatly enhanced, even about two or three orders at some

  • Plasmon modes in N- layer graphene structures at zero temperature
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-07-20
    Phuong Dong Thi Kim, Men Nguyen Van

    We investigate the plasmon frequency and the broadening function corresponding to Landau damping in a N-MLG structure consisting of N, up to 5, MLG sheets at zero temperature. Our results present that plasmon dispersions in the system include an in-phase optical mode and \(N - 1\) out-of-phase acoustic ones. The optical (acoustic) plasmon frequency is higher (lower) than that of MLG at the same parameters

  • Research Progress of Thermal Contact Resistance
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-07-18
    Xiaoshan Pan, Xiaoyu Cui, Shaoshuai Liu, Zhenhua Jiang, Yinong Wu, Zhichao Chen

    Thermal contact resistance of solid–solid interface is involved in many fields such as aerospace, low-temperature superconductivity and electronic machinery. With the booming of aerospace technology, the requirements for space detectors continue to increase; the research on accurate prediction, measurement and utilization of thermal contact resistance is becoming increasingly serious. This article

  • Superfluid Response of Parahydrogen Clusters in Superfluid $$^4$$ 4 He
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-07-10
    Massimo Boninsegni

    First-principle computer simulations yield evidence of a finite superfluid response at low temperature of a parahydrogen cluster of 15 molecules in bulk superfluid \(^4\)He. The superfluid fraction is worth \(\sim 44\)% at \(T=0.25\) K, growing to about \(\sim 66\%\) at \(T=0.15\) K, i.e., it is substantially reduced compared to that of the same cluster in vacuo, due to higher molecular localization

  • Excess Conductivity, Diamagnetic Transition and FTIR Spectra of Ca Substituted by La in (Bi,Pb):2212 Superconducting System
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-07-08
    A. Sedky, Amna Salah

    We report here measurements of the excess conductivity, the diamagnetic transition and the FTIR spectra of Bi1.7Pb0.30 Sr2Ca1−xLaxCu2Oy superconductor with various x values (0.00 ≤ x ≤ 0.30). It is found that the magnetic moment is negative below the diamagnetic transition in both field cooling (FC) and zero-field cooling (ZFC) for all samples. Furthermore, the magnetic moment is gradually shifted

  • Feasibility of Laboratory-Based EXAFS Spectroscopy with Cryogenic Detectors
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-07-04
    Simon J. George, Matthew H. Carpenter, Stephan Friedrich, Robin Cantor

    Extended X-ray absorption fine structure (EXAFS) spectroscopy is a powerful technique that gives element-specific information about the structure of molecules. The development of a laboratory EXAFS spectrometer capable of measuring transmission spectra would be a significant advance as the technique is currently only available at synchrotron radiation lightsources. Here, we explore the potential of

  • Simultaneous Noise and Impedance Fitting to Transition-Edge Sensor Data Using Differential Evolution
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-30
    A. P. Helenius, T. A. Puurtinen, K. M. Kinnunen, I. J. Maasilta

    We discuss a robust method to simultaneously fit a complex multi-body model both to the complex impedance and the noise data for transition-edge sensors. It is based on a differential evolution (DE) algorithm, providing accurate and repeatable results with only a small increase in computational cost compared to the Levenberg–Marquardt (LM) algorithm. Test fits are made using both DE and LM methods

  • Chaotic Motions in Dynamic High-Tc Superconducting Levitation System with Thermal Effects
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-30
    Yi Huang, Zhong-Cheng Qin, Fu-Jin Ma

    The chaotic motions were shown by the vibrations of a bulk permanent magnet (PM) supported by a cylindrical high-Tc superconductor (HTSC) under external disturbance in very early experiments. There are few theoretical studies on the nonlinear behaviors of the HTSC levitation system as the complex interaction between the HTSC and PM. In this paper, we developed a numerical program to analyze the nonlinear

  • Superconducting On-chip Fourier Transform Spectrometer
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-22
    R. Basu Thakur, N. Klimovich, P. K. Day, E. Shirokoff, P. D. Mauskopf, F. Faramarzi, P. S. Barry

    The kinetic inductance effect is strongly nonlinear with applied current in NbTiN, TiN and NbN thin films. This can be utilized to realize novel devices. We present results from transmission lines made with these materials, where DC (current) control is used to modulate the phase velocity thereby enabling on-chip spectrometers. Utility of such compact spectrometers is discussed, along with their natural

  • X-ray Spectroscopy of Muonic Atoms Isolated in Vacuum with Transition Edge Sensors
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-13
    S. Okada, T. Azuma, D. A. Bennett, P. Caradonna, W. B. Doriese, M. S. Durkin, J. W. Fowler, J. D. Gard, T. Hashimoto, R. Hayakawa, G. C. Hilton, Y. Ichinohe, P. Indelicato, T. Isobe, S. Kanda, M. Katsuragawa, N. Kawamura, Y. Kino, Y. Miyake, K. M. Morgan, K. Ninomiya, H. Noda, G. C. O’Neil, T. Okumura, C. D. Reintsema, D. R. Schmidt, K. Shimomura, P. Strasser, D. S. Swetz, T. Takahashi, S. Takeda,

    High-resolution X-ray spectroscopy of the highly charged muonic atoms/ions isolated in vacuum is an ideal probe to explore quantum electrodynamics under extremely strong electric fields, which is one of the major topic in fundamental atomic physics. A feasibility test measurement with a low-density neon gas target was performed by observing X-rays emitted by muonic neon via the \(5 \rightarrow 4\)

  • Friction Force Limits the Drift of Microparticles Along the Quantum Vortex in Liquid Helium
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-12
    Aleksey A. Skoblin, Dmitry V. Zlenko, Sergey V. Stovbun

    Massive enough particles of frozen hydrogen are known to be captured by quantum vortices in liquid helium. Here, we theoretically demonstrate that the drift of such particles along the vortex is limited by the friction force, which was explicitly calculated. Our hypothesis explains the stabilization of the micron-sized particles’ position on the axis of the vertical vortices despite the significant

  • On the Closure Problem of the Coarse-Grained Hydrodynamics of Turbulent Superfluids
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-12
    Sergey K. Nemirovskii

    The coarse-grained hydrodynamics of turbulent superfluid fluids describes the fluid flow in terms of two equations for the averaged normal and superfluid velocities. These two equations are coupled via the mutual friction term, which contains the quantity \({\mathcal {L}}(r,t)\)–the vortex line density (VLD) of the vortex tangle. The question of how to treat the quantity \({\mathcal {L}}(r,t)\)–the

  • Cooper-Pair Tunneling in Small Josephson Junction Arrays Under Radio-Frequency Irradiation
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-12
    Godwill Mbiti Kanyolo, Kouichi Takeda, Yoshinao Mizugaki, Takeo Kato, Hiroshi Shimada

    The influence of radio-frequency microwaves on the Coulomb blockade characteristics in small Josephson junctions was studied using a one-dimensional array of ten small Al tunnel junctions in the frequency range from 1 to 1000 MHz. Coulomb blockade voltage (\(V_\mathrm{th}\)) is diminished with increasing microwave power (\(V_\mathrm{ac}\)), where the \(V_\mathrm{th}\)–\(V_\mathrm{ac}\) plots for varied

  • Strong-Coupling Effects on Quantum Transport in an Ultracold Fermi Gas
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-10
    Koichiro Furutani, Yoji Ohashi

    We theoretically investigate quantum conductance across a point contact between two strongly-interacting ultracold Fermi gases. We evaluate the tunneling current, taking into account pairing fluctuations in the Fermi gases within the framework of a combined strong-coupling T-matrix approximation with the Schwinger-Keldysh non-equilibrium formalism. We show that quasi-particle conductance is gradually

  • Mitigating the Effects of Charged Particle Strikes on TES Arrays for Exotic Atom X-ray Experiments
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-10
    H. Tatsuno, D. A. Bennett, W. B. Doriese, M. S. Durkin, J. W. Fowler, J. D. Gard, T. Hashimoto, R. Hayakawa, T. Hayashi, G. C. Hilton, Y. Ichinohe, H. Noda, G. C. O’Neil, S. Okada, C. D. Reintsema, D. R. Schmidt, D. S. Swetz, J. N. Ullom, S. Yamada

    Exotic atom experiments place transition-edge sensor (TES) microcalorimeter arrays in a high-energy charged particle-rich environment. When a high-energy charged particle passes through the silicon substrate of a TES array, a large amount of energy is deposited and small pulses are generated across multiple pixels in the TES array due to thermal crosstalk. We have developed analysis techniques to assess

  • Lowering the Energy Threshold of the CUORE Experiment: Benefits in the Surface Alpha Events Reconstruction
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-10
    Alice Campani, D. Q. Adams, C. Alduino, K. Alfonso, F. T. Avignone, O. Azzolini, G. Bari, F. Bellini, G. Benato, M. Biassoni, A. Branca, C. Brofferio, C. Bucci, A. Caminata, L. Canonica, X. G. Cao, S. Capelli, L. Cappelli, L. Cardani, P. Carniti, N. Casali, D. Chiesa, N. Chott, M. Clemenza, S. Copello, C. Cosmelli, O. Cremonesi, R. J. Creswick, A. D’Addabbo, D. D’Aguanno, I. Dafinei, C. J. Davis, S

    CUORE is a tonne-scale cryogenic experiment located at the Laboratori Nazionali del Gran Sasso that exploits bolometric technique to search for neutrinoless double beta decay of \(^{130}{\hbox {Te}}\). Thanks to its very low background and large mass, CUORE is also a powerful tool to study a broad class of phenomena, such as solar axions and WIMP scattering. The ability to conduct such sensitive searches

  • Kramers–Kronig Relations for the Dielectric Permittivity of the Coulomb System with a Single-Species Bose–Einstein Condensate
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-06
    V. B. Bobrov, S. A. Trigger

    Using the linear response theory and the concept of off-diagonal long-range order, the Kramers–Kronig relations for the dielectric permittivity of a disordered Coulomb system in the presence of a single-component Bose–Einstein condensate for nuclei are obtained.

  • Progress in Cooling Nanoelectronic Devices to Ultra-Low Temperatures
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-05
    A. T. Jones, C. P. Scheller, J. R. Prance, Y. B. Kalyoncu, D. M. Zumbühl, R. P. Haley

    Here we review recent progress in cooling micro-/nanoelectronic devices significantly below 10 mK. A number of groups worldwide are working to produce sub-millikelvin on-chip electron temperatures, motivated by the possibility of observing new physical effects and improving the performance of quantum technologies, sensors and metrological standards. The challenge is a longstanding one, with the lowest

  • Optical Absorption and Tsallis Entropy of Polaron in Monolayer Graphene
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-03
    C. Kenfack-Sadem, S. Mounbou, S. I. Fewo, M. F. C. Fobasso, A. J. Fotue, L. C. Fai

    We studied the effect of polar vibration modes on optical absorption of polaron and the rate of disorder in a graphene monolayer. Our investigation focused more particularly on the role played by phonons. We found that the amplitude of optical absorption decreases with increasing photon energy and with increasing magnetic field. We also found that the rate of local disorder in the system increases

  • Role of Co 3 O 4 Nanoparticles Addition in Infield Superconducting Properties of CuTl-1223 Phase
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-03
    M. Imran, M. Zareef Khan, M. Waqee-Ur-Rehman, Asmat Ullah, S. Ahmed, K. Nadeem, M. Mumtaz

    The role of ferromagnetic cobalt tetraoxide (Co3O4) nanoparticles’ addition in (Cu0.5Tl0.5) Ba2Ca2Cu3O10-δ (CuTl-1223) superconductor was investigated via infield transport properties measurements. The solgel method was used for synthesis of Co3O4 nanoparticles and CuTl-1223 superconducting phase was prepared by solid-state reaction method. These Co3O4 nanoparticles were added in appropriate ratio

  • Structure and Optical Band Gap of Inverse Spinel Zn 2 SnO 4 Epitaxial Films
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-03
    Feng Lu, Qinzhuang Liu

    Inverse spinel Zn2SnO4 (ZTO) films have been grown on MgO(001) and MgAl2O4(001) substrates by pulsed laser deposition. Detailed structural investigation by high-resolution X-ray diffraction, including conventional θ–2θ linear scans, φ scans and reciprocal space mappings, revealed the epitaxial characteristics of the ZTO films. Meanwhile, the in-plane and out-of-plane lattice parameters were extracted

  • Magneto-Transport Properties of the Ag Doping Sr Site in La 0.57 Nd 0.1 Sr 0.33−x Ag x MnO 3 (0.00 and 0.15) Manganites
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-06-03
    Y. Marouani, S. Gharbi, F. Issaoui, E. Dhahri, B. F. O. Costa, M. A. Valente, M. Jemmali

    In this work we investigate the effect of Ag+ doping at Sr2+ site in La0.57Nd0.1Sr0.33−xAgxMnO3 (LNSAMOx, x = 0.00 and 0.15) system on the magnetic and magneto-electrical properties. The variation of the magnetization M versus temperature T, at 0.05 T, reveals a ferromagnetic–paramagnetic transition for all samples. All samples undergo a sharp metal–semiconductor transition at a temperature Tρ, accompanying

  • Crystal-Field and Exchange Parameters Obtained from the High-Field Magnetization of ErFe 11 Ti: Revisited
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-05-30
    N. V. Kostyuchenko, I. S. Tereshina, E. A. Tereshina-Chitrova, A. K. Zvezdin

    We perform a high-field magnetization study for the single-crystalline ferrimagnetic ErFe11Ti compound in order to redefine the crystal-field and exchange parameters. For the first time, we predict theoretically the magnetization behavior of ErFe11Ti up to 100 T magnetic field. The latter allows us to observe the full magnetization process (up to the forced-ferromagnetic state) in ErFe11Ti. The results

  • High Energy Background Event Identification Using Local Group Trigger in a 240-pixel X-ray TES Array
    J. Low. Temp. Phys. (IF 1.09) Pub Date : 2020-05-29
    S. Yamada, R. Hayakawa, 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 novel triggering function developed for 240-pixel Transition-Edge Sensors is demonstrated under the high rate of particle background. The function is integrated into the standard data acquisition system in the NIST TES framework. It enables any type of combination of trigger pattern when a pixel is triggered, which is called “group trigger.” As a practical implementation, the primary trigger is distributed

  • 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 1.09) 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

  • Solvable Model of the Thermal Persistent Current at Low Temperatures of Two-Electron Parabolic GaAs Quantum Dot
    J. Low. Temp. Phys. (IF 1.09) 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

  • Fabrication of Bismuth Absorber Arrays for NTD-Ge Hard X-ray Microcalorimeters
    J. Low. Temp. Phys. (IF 1.09) 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

  • Low-Temperature Magnetic Properties and Magnetocaloric Effect of Fe–Zr–Cu Amorphous Alloys
    J. Low. Temp. Phys. (IF 1.09) 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

  • Observation of Frequency Up-Conversion Gain in SIS Junctions at W Band
    J. Low. Temp. Phys. (IF 1.09) 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

  • Magnetocaloric Properties of Gd 1−x Ho x MnO 3 Multiferroic Compounds
    J. Low. Temp. Phys. (IF 1.09) 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

  • New Approaches to Low-Energy Calibration of Cryogenic Detectors
    J. Low. Temp. Phys. (IF 1.09) 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

  • Experimental Validation of Calorimetric Electron Capture Spectral Theory with $${}^{193}$$193 Pt
    J. Low. Temp. Phys. (IF 1.09) 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

  • 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 1.09) 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

  • COSINUS: Cryogenic Calorimeters for the Direct Dark Matter Search with NaI Crystals
    J. Low. Temp. Phys. (IF 1.09) 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

  • Progress Report on the Large-Scale Polarization Explorer
    J. Low. Temp. Phys. (IF 1.09) 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

  • 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 1.09) 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

  • Atomically Layered Helium Films at Ultralow Temperatures: Model Systems for Realizing Quantum Materials
    J. Low. Temp. Phys. (IF 1.09) 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

  • 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 1.09) 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

  • GPU Supported Simulation of Transition-Edge Sensor Arrays
    J. Low. Temp. Phys. (IF 1.09) 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

  • Hyperspectral X-ray Imaging with TES Detectors for Nanoscale Chemical Speciation Mapping
    J. Low. Temp. Phys. (IF 1.09) 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

  • 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 1.09) 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

  • The Role of Multiple Fluctuation Events in NbN and NbTiN Superconducting Nanostrip Single-Photon Detectors
    J. Low. Temp. Phys. (IF 1.09) 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

  • The Phonon-Mediated TES Cosmic Ray Detector for Focal Plane of ATHENA X-Ray Telescope
    J. Low. Temp. Phys. (IF 1.09) 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

  • The Demonstration Model of the ATHENA X-IFU Cryogenic AntiCoincidence Detector
    J. Low. Temp. Phys. (IF 1.09) 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

  • The CUORE Data Acquisition System
    J. Low. Temp. Phys. (IF 1.09) 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

  • Improving Energy Detection Efficiency of Ti-Based Superconducting Transition-Edge Sensors with Optical Cavity
    J. Low. Temp. Phys. (IF 1.09) 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

  • Ti Hot Electron Bolometers with Johnson Noise Readout for Terahertz Radiation Detection
    J. Low. Temp. Phys. (IF 1.09) 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

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