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Magnetic-thermal-mechanical coupling behavior simulation for a porous high-temperature superconductor based on fractal derivatives Physica C (IF 1.7) Pub Date : 2024-03-06 Feng Xue, Yunfei Huang, Xinxin Zhou, Xiaofan Gou
In this paper, the magnetic-thermal-mechanical coupling behavior for a porous high-temperature superconductor placed in a pulsed field is studied numerically within the framework of finite element analysis and based on fractal derivatives. Firstly, as a kind of oxide ceramic material, the porous properties of high-temperature superconductors (SCs) are characterized through fractal methods. Then, we
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Electromechanical behavior of a rectangular bulk superconductor with an inhomogeneous critical current density under pulsed-field magnetization Physica C (IF 1.7) Pub Date : 2024-03-05 Yu Yang, Lingyun Jian
Bulk high-temperature superconductors are widely used in various superconducting devices for their high critical current density and the ability to trap large magnetic field. In some applications, bulk superconductors can be arranged in an array structure to increase the magnetic field strength. However, rectangular bulk superconductors can be arranged more compactly than commonly used cylindrical
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Effects of Rashba and Dresselhaus spin-orbit couplings on the critical temperature and paramagnetic limiting field of superconductors with broken inversion symmetry Physica C (IF 1.7) Pub Date : 2024-02-29 H. Yavari, M. Tayebantayeba
Transition temperature (T) and paramagnetic limiting of a superconductor without spatial inversion symmetry in the presence of both Rashba and Dresselhaus antisymmetric spin-orbit couplings is studied. The critical temperature is derived for anisotropy of the superconducting order parameter, ranging from isotropic s-wave to any pairing state with nonzero angular momentum and mixed parity singlet-triplet
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Bending characteristics of a round strand made by stacked HTS tapes Physica C (IF 1.7) Pub Date : 2024-02-28 X.Q. Lai, P.Y. Li, J.X. Zuo, L.Y. Sun, H.H. Wei
Although the development of REBCO coated conductor has proved its superiority of critical current in high-field background, mechanical issues caused by electromagnetic forces are still big challenges. Large-scale magnets call for robust and high-J cables for simplicity of the system. To meet the requirements, here we report a round cable comprised of a stack of 2 mm wide high-temperature superconducting
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A novel numerical method to evaluate the heat transfer characteristics of complicated CICC structures Physica C (IF 1.7) Pub Date : 2024-02-28 Fengyang Han, Zhifan Liu, Zhifeng Liu, Qiyong Zhang, Xiaohong Wang, Min Wang
In this article, we propose a numerical model for calculating the external heat transfer coefficient between the bundle region and its wall for cables in conduit conductor (CICC). With the assumption of local thermal equilibrium, one macro equation describing the steady heat transfer on the cross section of the CICC can be obtained. A key parameter, the effective transverse thermal conductivity , which
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Design and experiment of conduction cooling HTS current leads suited for superconducting Wiggler magnets Physica C (IF 1.7) Pub Date : 2024-02-28 Haifeng Zhang, Guangli Kuang, Weiming Li, Junjie Li, Huaikuang Ding, Xuehua Zhang
The cryogenic system of the 6T superconducting Wiggler magnets at the Hefei National Synchrotron Radiation Laboratory was upgraded. During the upgrade process, the original copper leads of the superconducting Wiggler magnets are replaced with two 460A high-temperature superconducting current leads and three 20A high-temperature superconducting current leads, reducing the heat load of the cryogenic
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Temperature reduction of an HTS transformer under short circuit fault by modifying the cryostat structure: Impact of Perlator and valve location Physica C (IF 1.7) Pub Date : 2024-02-28 Mahdi Mahamed, Seyyedmeysam Seyyedbarzegar
High Temperature Superconducting (HTS) transformers are one of the potential technologies for power systems connected to offshore wind farms and stand-alone and bulk power grids. In such systems, proper fault performance of any electric device including HTS transformer is a vital factor to ensure a safe, and reliable delivery of electric power as well as power quality in electric grid. Short circuits
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The improved model based on the H-A formulation in large-scale HTS magnet Physica C (IF 1.7) Pub Date : 2024-02-28 Xiaoyu Ji, Benzhe Zhou, Yong Chen, Shixian Liu, Qiuliang Wang, Jianhua Liu
The rapid progression of the rare earth barium copper oxide (REBCO) coated conductor have paved the way for the development of high-field superconducting magnets. However, the elevated aspect ratio of REBCO tapes results in the generation of substantial screening currents, presenting a formidable challenge in the electromagnetic analysis of high-field superconducting magnets. Currently, the finite
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Influences of oxygen partial pressure on the phase composition of the (Bi, Pb)-2212 precursor powder Physica C (IF 1.7) Pub Date : 2024-02-28 Wen Zhang, Shengnan Zhang, Hao Cao, Botao Shao, Xueqian Liu, Jixing Liu, Qing Yang, Chengshan Li, Pingxiang Zhang
Bi-2223 tapes, synthesized through the two-powder method, exhibit distinctive features such as high current density and a controllable secondary phase. Traditionally, the two-powder method involves the separate preparation of Bi-2212 and CaCuO powders followed by their mixing. However, during this process, it is necessary to dope the Bi-2212 powder with an appropriate Pb content to achieve a stable
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Electromagnetic response analysis of high temperature superconducting coated conductor tape with local debonding: Case of transporting current in an external magnetic field Physica C (IF 1.7) Pub Date : 2024-02-20 Yumei Yang, Pengpeng Wu, Haijun Lou, Zhipeng Li, Fangming Lei
In this article, the electromagnetic mechanical behavior of a long superconducting coating tape within a local internal cracking was analyzed when it transport current in a perpendicular magnetic field. Based on the superconducting critical state model, the distribution of current and magnetic field within the structure were calculated. Then, the control equation for the correlation between the flux
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Flux creep regimes and vortex phase diagram in β-FeSe single crystals Physica C (IF 1.7) Pub Date : 2024-02-15 L. Lanoël, N. Haberkorn, G. Nieva
We analyze the relationship between critical current densities () and flux creep rates () in β-FeSe single crystals. This analysis was based on magnetization measurements. Additionally, we establish correlations with the recently reported magnetic field-induced geometrical deformation of the vortex lattice, transitioning from hexagonal to square shape due to a rhombic distortion [A. V. Putilov et al
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On the path to superconductor broadband receivers Physica C (IF 1.7) Pub Date : 2024-02-13 Nikolay V. Kolotinskiy, Victor K. Kornev
We review progress in developing software-defined radio communication systems through using superconductive rf and digital technologies. Both the outstanding sensitivity and high spurious-free dynamic range (SFDR) of the state-of-the-arts superconductor analog-to-digital converters (ADC) enable broadband receiving systems with direct signal digitizing and subsequent digital extraction of sub-bands
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Model of a superconducting spin valve with insulating layers Physica C (IF 1.7) Pub Date : 2024-01-29 A.A. Kamashev, A.A. Validov, N.N. Garif'yanov, I.A. Garifullin
Two different types of superconducting spin valve structures CoOx/Co1/I1/Pb/I2/Co2 (where I1 and I2 are insulating layers) and CoOx/Co1/Pb/Co2 were investigated. Obtained results for CoOx/Co1/I1/Pb/I2/Co2 structures demonstrate the full superconducting spin valve effect with a fairly significant effect value. The superconducting spin valve effect was absent for the same structure without insulating
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Electromagnetic design of MRI superconducting magnet based on novel hybrid optimization methods Physica C (IF 1.7) Pub Date : 2024-02-02 Yunhao Mei, Qingyun Liu, Huiyu Du, Yufu Zhou, Zhengrong Liu, Lei Mo, Bensheng Qiu, Qing Zhang
This paper proposes a novel hybrid optimization algorithm that combines linear programming (LP), genetic algorithm (GA), and nonlinear programming (NLP) to achieve the optimal design of highly homogeneous superconducting magnets for MRI systems. Initially, the predetermined rectangular region is divided into an array of superconductor coils. Then, linear programming is utilized to minimize the consumption
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Vortex state in a 3D superconducting mesoscopic wedge Physica C (IF 1.7) Pub Date : 2024-01-26 C.A. Aguirre, P. Díaz, D. Laroze, A.S. Mosquera Polo, J. Barba-Ortega
In the present paper, we study the effect of the boundary conditions (deGennes-parameter b) on the magnetization (M), critical fields (H1,H2), and Cooper pair density (|ψ|2) in a three-dimensional superconducting meso-wedge, solving the time-dependent Ginzburg–Landau equations TDGL. These equations are solved by taking into account the demagnetization effects. We show that the slope of the superconducting
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Periodic-threshold amalgamated quasi-one-junction SQUID comparator Physica C (IF 1.7) Pub Date : 2024-01-19 Siqi Li, Minghui Niu, Huanli Liu, Xiaoping Gao, Liliang Ying, Jie Ren
This article proposes a periodic-threshold superconductive comparator named amalgamated quasi-one-junction SQUID comparator (AQOS) for sensitivity enhancement. The comparator employs a pair of compound Josephson-junction SQUID with magnetically-controlled effective critical current in quantization to relieve the constraints on the period current without disrupting the non-hysteresis operation state
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First-principles study on the electronic structure and optical properties of orthorhombic CaTiO3 under different pressures Physica C (IF 1.7) Pub Date : 2024-01-17 Xinping Guo, Yongbo Li, Wenbo Xiao, Huaming Wu
The lattice constants, band structure, density of states (DOS), and optical properties of orthorhombic CaTiO3 in the pressure range of 0–100 GPa were calculated using the GGA-PBE method based on first-principles in this study. Geometry structure optimization results show that with an increase in pressure, the lattice constants of orthorhombic CaTiO3 decrease and the band gap (Eg) value increases. However
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Hysteresis loops in measurements of the magnetic moment of hydrides under high pressure: Implications for superconductivity Physica C (IF 1.7) Pub Date : 2024-01-14 J.E. Hirsch
Measurements of magnetic moments of hydride materials under high pressure have been claimed to prove the existence of superconductivity in these materials (Drozdov et al., 2015; Minkov et al., 2021; Minkov et al., 2022; Minkov et al., 2023[4,6]; Eremets et al., 2022) . However, detection of the signal from the small sample requires subtraction of a large background contribution whose details are largely
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The local rupture of the superconductivity and the curvature of the mesoscopic sample Physica C (IF 1.7) Pub Date : 2024-01-13 Isaías G. de Oliveira, Jonathan S. de Morais, Paloma F. Ferreira
In this article we revisit a well-known effect in superconductors, which is the penetration of the magnetic field by regions of greater radius of curvature (Tinkham, 2008; De Gennes, 1966). This is exposed in the literature but without a quantitative solution. Here we solve this problem by two distinct numerical simulations. We calculate the superconducting current density using numerical simulations
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Modeling of induced currents in a type-II superconducting cylinder of finite length in a transverse magnetic field Physica C (IF 1.7) Pub Date : 2023-12-27 Yuriy Zhilichev
Induced currents in the bulk superconducting cylinder of finite length placed in a transverse magnetic field are calculated by the partial and complete separation of variables. The Fourier transform over the angular and axial coordinates reduces the problem to the solution of one-dimensional integral equations. The harmonic balance method is applied to account for the highly nonlinear constitutive
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Study on Electric and Magnetic Loadings in Fully Superconducting Motor Design Physica C (IF 1.7) Pub Date : 2023-12-27 Yutaka Terao, Satsuki Okumura, Hiroyuki Ohsaki
This paper provides the relations between the electric loadings and the magnetic loadings, for fully superconducting motor (FSCM) design; the FSCMs used both rare-earth barium copper oxide (REBCO) field windings and MgB2 armature windings. The authors adopted the FSCMs-electromagnetic design under the conditions of changing the electric loadings and the magnetic loadings as well as the rotation speeds
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Investigation of a repeatable and widely applicable method to reduce the turn-to-turn contact resistivity of REBCO tapes Physica C (IF 1.7) Pub Date : 2023-12-27 Zili Zhang, Lang Qin, Huimin Zhang, Hongli Suo, Jianhua Liu, Lei Wang, Qiuliang Wang
In this study, a repeatable and widely applicable method for decreasing the turn-to-turn contact resistivity of REBa2Cu3O7-x (RE=rare earth, REBCO) tapes was demonstrated. By applying a solder without further connections, the contact resistivity can be significantly and consistently decreased to low values. Four solders and five REBCO tapes from various manufacturers were tested to demonstrate the
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Numerical evaluation of the impact of introducing heterogeneous structures into the REBCO layer on fracture behavior under tensile strain Physica C (IF 1.7) Pub Date : 2023-12-27 Zhaofei Jiang, XinXin Zhou, Xiangyang Wu, Xinxing Qian
To enhance the mechanical strength of REBCO tapes, a technique involving the creation of "heterogeneous structures" within the REBCO layer has been developed. This method entails drilling small holes in buffer layers and filling them with metal material, resulting in the formation of heterogeneous structures that effectively suppress crack propagation. What we are concerned about is the mechanism by
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Investigation of the effect of non-uniform stress distribution on the transient electromagnetic behavior of a no-insulation REBCO racetrack coil Physica C (IF 1.7) Pub Date : 2023-12-27 Shixian Liu, Lei Wang, Yong Chen, Benzhe Zhou, Luzhong Wang, Xiaoyu Ji, Xinning Hu, Qiuliang Wang
Racetrack superconducting coils are widely used in magnetic levitation (maglev), generators, and accelerators, showing very important application prospects in many fields. However, due to the special geometry, the straight part and the arc part of the coil are given different radial stresses during the winding, cooling, and excitation, which will cause a difference in their transient performance during
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Fabrication and characterization of sub-micron high current density NbN Josephson junctions for large-scale digital circuits Physica C (IF 1.7) Pub Date : 2023-12-27 Yingyi Shao, Huiwu Wang, Wei Peng, Jie Ren, Zhen Wang
We have developed a fabrication process based on Chemical Mechanical Polishing (CMP) for the sub-micron NbN Josephson junctions on single-crystal MgO substrates. The NbN junctions were fabricated with epitaxial NbN/AlN/NbN trilayers deposited by reactive DC magnetron sputtering. The top electrode of the junction was exposed using CMP to contact the NbN wire without opening the submicron via through
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Fabrication of high-critical current density Nb/Al-AlN/Nb junctions with an AlN barrier deposited by DC magnetron reactive sputtering Physica C (IF 1.7) Pub Date : 2023-12-20 Xue Zhang, Xiangge Wu, Liliang Ying, Linxian Ma, Weifeng Shi, Hui Xie, Wei Peng, Jie Ren
We have developed a process to fabricate submicron Nb/Al-AlN/Nb junctions using an AlN barrier layer deposited by DC magnetron reactive sputtering, a SiO2 cap-layer and Chemical Mechanical Polishing (CMP) were introduced in the process. Junctions of designed diameters of 0.5–3.0 μm with Jc ranging from 15 to 120 kA/cm2 were fabricated. Jc·t is exponentially dependent on the deposition time (t) of AlN
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Conceptual design of hybrid IBS-REBCO magnet and a study on joint technology for high-field application Physica C (IF 1.7) Pub Date : 2023-12-16 Xinxing Qian, Zhen Fang, Yilong Li, Zhaofei Jiang
The REBa2Cu3Ox (REBCO) tape, known for its exceptional mechanical properties, stands as an optimal conductor for high-field applications. Nevertheless, stress degradation attributed to the membrane and monofilament structure of REBCO tape often occurs in high-field REBCO coils. On the other hand, iron-based superconductor (IBS) tapes offer notable advantages, including multifilament structure and upper
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Machine learning driven optimization and parameter selection of multi-surface HTS Maglev Physica C (IF 1.7) Pub Date : 2023-12-12 Erkan Caner Ozkat, Murat Abdioglu, U. Kemal Ozturk
This research aims to tackle the challenges posed by precise force measurement for high temperature superconducting (HTS) Maglev systems, including mechanical constraints, step motor limitations, and sensor resolutions. For this aim, six machine learning (ML) models namely Support Vector Machine (SVM), Gaussian Process Regression (GPR), Extreme Gradient Boosting (XGB), Long Short-Term Memory (LSTM)
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Superconducting quantum criticality and the anomalous scaling: A nonlinear relativistic equation Physica C (IF 1.7) Pub Date : 2023-12-04 Yong Tao
By using the Landau-Ginzburg-Wilson paradigm, we show that, near a quantum critical point (QCP), Cooper pairs at zero temperature would obey a nonlinear relativistic equation, where the imaginary time emerges as a novel dimension. This relativistic equation is applicable to certain superconductors at zero temperature for which the Faber-Pippard coherence length formula holds at and above the upper
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On parametric amplification in discrete Josephson transmission line Physica C (IF 1.7) Pub Date : 2023-12-05 Eugene Kogan
We consider the discrete series-connected lossy Josephson transmission line, constructed from Josephson junctions, capacitors and resistors (one-dimensional array of Josephson junctions). We derive equations describing pump, signal, and idler interaction in the system and calculate the thresholds for the parametric amplification.
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Can linear transformations bend a straight line? Comment on “Author Correction: Magnetic field screening in hydrogen-rich high-temperature superconductors” Physica C (IF 1.7) Pub Date : 2023-12-04 J.E. Hirsch
Minkov et al. (2022) claims to show magnetization measurements that demonstrate that sulfur hydride and lanthanum hydride under pressure are high temperature superconductors. In Hirsch and Marsiglio (2023), it was pointed out that Figs. 3a and 3e of Minkov et al. (2022) in its original form, Ref. [3], were inconsistent with each other according to the figure caption and text in Ref. [3]. Recently,
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Effect of insulating dense pinning centers on pinning potential and transport critical current density of YBCO superconductors Physica C (IF 1.7) Pub Date : 2023-12-01 Ipsita Mukherjee, Probhu Mandal, Ajay Kumar Ghosh
Insulating phase included in the inter-granular region of a granular superconducting YBCO affects both the superfluid density and critical current density at the zero magnetic field. Even a highly dense population of about 40 % (weight%) of the BZO insulating particles is found to be unable to destroy the superconducting nature completely. We have studied current-voltage (IV) characteristics of several
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Fault current limiter based on high temperature superconductors Physica C (IF 1.7) Pub Date : 2023-11-23 Pascal Tixador
High Temperature Superconductors (HTS) made the Superconducting Fault Current Limiter (SFCL) a reality in power electric grids. Resistive SFCL, which is the subject of this article, is based on a unique property of superconductors to quench from a non-dissipative to a high dissipative state above a given current. SFCL is an attractive response to the poorly solved problem of fault currents in power
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Guided vortex motion in a ferromagnet-superconductor bilayer Physica C (IF 1.7) Pub Date : 2023-11-21 P. Gierłowski, I. Abaloszewa, P. Przysłupski, G. Jung
Vortex motion in ferromagnetic-superconducting bilayers constituted by thin manganite La0.67Sr0.33MnO3 film deposited on the top of thin YBa2Cu3O7−δ film has been investigated. Both films were deposited on uniformly twinned single-crystalline substrates and patterned into strips directed at different angles to the twin lines pattern. These conditions lead to the guided vortex motion at different angles
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The effect of Li doping on superconductivity of SiH4(H2)2 from first-principles calculations Physica C (IF 1.7) Pub Date : 2023-11-16 Shuang Zhao, Wei Zeng, Zheng-Tang Liu, Qi-Jun Liu, Juan Gao, Zhen Jiao
From first-principles calculations, we calculated the crystal structure, electronic properties, and phonon properties of SiH4(H2)2 and LiSiH4(H2)2 at 180 GPa, respectively. The electronic properties of SiH4(H2)2 and LiSiH4(H2)2 were studied by analyzing the band structure, density of states (DOS), charge density and Mulliken population. The results show that both substances are metals. However, the
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Role of inter-site Coulomb interaction on the thermodynamic and ground state properties within the t−J−U−V model Physica C (IF 1.7) Pub Date : 2023-11-17 Chumki Tarafdar, Nanda Kumar Ghosh, Subhadip Nath
In this work, we report the effect of nearest neighbor (NN) inter-site Coulomb interaction (V) with a certain finite value of on-site Coulomb repulsion (U) and NN antiferromagnetic exchange interaction (J) in the context of high-Tc cuprates. An exact diagonalization method has been applied in a 2D t−J−U model extended by NN inter-site Coulomb interaction in the tilted square cluster near optimal doping
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MOCVD deposited double-sided CeO2 buffer layer for YBCO superconducting film grow on R-plane Al2O3 substrate Physica C (IF 1.7) Pub Date : 2023-11-08 Qichen Wang, Mebrouka Boubeche, Yudong Xia, Ruipeng Zhao, Kai Ou, Jingting Yang, Jijun Xin, Wei Wang, Kui Jin, Bowan Tao
Double-sided CeO2/YBCO films were grown on the double-sided polishing R-plane Al2O3 substrate using MOCVD technology. The effects of deposition parameters of the MOCVD setup on the structural orientation and surface morphology of CeO2 buffer layers grown on sapphire substrates were investigated. A series of CeO2 buffer layers were prepared by varying the substrate temperature and oxygen flow rate.
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Variation of the performance of YBa2Cu3O7−δ radio frequency superconducting quantum interference device with bicrystal grain boundary angle Physica C (IF 1.7) Pub Date : 2023-11-02 Tie-Quan Xu, Yu-Long Li, Hong-Zhang Wang, Yue Wang, Fu-Ren Wang, Zi-Zhao Gan
High transition temperature (high-Tc) superconducting quantum interference devices (SQUIDs) based on bicrystal grain boundary junctions have been utilized in a wide range of applications. To explore the effect of the bicrystal grain boundary angle on the property of the high-Tc SQUID, we fabricated and characterized YBa2Cu3O7−δ (YBCO) radio frequency (rf) SQUIDs using [001]-tilt grain boundary junctions
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Research on the current compensation mechanism of FJTL in ERSFQ Physica C (IF 1.7) Pub Date : 2023-11-01 Bicong Weng, Yujian Ding, Wei Peng, Jie Ren
Energy-efficient rapid single flux quantum (ERSFQ) devices have unique energy advantages with a power consumption of less than 0.001fJ per single-bit switch, even considering the energy required for the refrigeration system, achieving ultra-low energy consumption of sub-fJ/bit. Combined with its typical operating frequency in the tens of GHz range, ERSFQ circuits have the potential to realize computing
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Atomic-layer engineering of nickelates (in search of novel superconductors) Physica C (IF 1.7) Pub Date : 2023-10-30 Ivan Božović, Gennady Logvenov, Vladimir Butko
Karl Alex Mueller's intuition was that the nature of mobile charge carriers in manganates and nickelates should be like those in cuprates, which he believed were Jahn-Teller polarons, so he expected them to also host high-temperature superconductivity (HTS). Following his suggestions and persuasion, in the past, we performed several experiments that included atomic-layer-by-layer synthesis of novel
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Vortex-core spectroscopy of d-wave cuprate high-temperature superconductors Physica C (IF 1.7) Pub Date : 2023-10-29 Ivan Maggio-Aprile, Tejas Parasram Singar, Christophe Berthod, Tim Gazdić, Jens Bruér, Christoph Renner
The mechanism of high-temperature superconductivity remains one of the great challenges of contemporary physics. Here, we review efforts to image the vortex lattice in copper oxide-based high-temperature superconductors and to measure the characteristic electronic structure of the vortex core of a d-wave superconductor using scanning tunneling spectroscopy.
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Zeeman splitting in doped antiferromagnetic semiconductors Physica C (IF 1.7) Pub Date : 2023-10-25 V.V. Kabanov
Zeeman splitting of conduction electrons in doped antiferromagnetic materials in the presence of a strong spin–orbit interaction is considered. Using symmetry arguments the Hamiltonian and the spectrum of conduction electrons near some time-reversal invariant momenta were constructed. It was shown, that in the vicinity of some time-reversal invariant momenta the external magnetic field perpendicular
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Superconducting properties and vortex pinning in intermetallic BaBi3 single crystals: A magnetization study Physica C (IF 1.7) Pub Date : 2023-10-28 N. Haberkorn, R.A. Ribeiro, Li Xiang, S.L. Bud'ko, P.C. Canfield
Hysteresis and magnetic relaxation measurements were performed on single crystals of BaBi3, which is an intermetallic compound exhibiting superconductivity with a critical temperature (Tc) of 5.9 K. The London penetration depth (λ) was determined to be 130 nm, and the coherence length (ξ) was estimated to be 13 nm. The critical current density (Jc) was found remarkably low, measuring 20,000 A/cm2 under
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Insights into the polaron physics of high temperature superconductors from optical and time-domain spectroscopy Physica C (IF 1.7) Pub Date : 2023-10-27 Dragan Mihailovic
Polarons and percolation were mentioned as guiding concepts in the paper by Bednorz and Müller in their report on the discovery of superconductivity in Ba–La–Cu–O. Both of these concepts seem to have survived, but their role in high-temperature superconductivity is somewhat different than originally envisaged. Optical and time-resolved experiments have been extremely useful for understanding the roles
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Jahn-Teller Polarons in metal oxides and their signature in local lattice distortions Physica C (IF 1.7) Pub Date : 2023-10-20 J. Mustre de Leon
We review evidence of local dynamical lattice distortions in perovskite transition metal oxides, including cuprates and nickelates. These distortions appear as changes of the local symmetry around the metal ions, which are manifest in x-ray absorption spectroscopy and other inelastic scattering techniques. The distortions imply that these materials exhibit inhomogeneous ground states in some regions
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Detection of colored noise correlation time with Josephson junctions Physica C (IF 1.7) Pub Date : 2023-10-20 O.V. Pountougnigni, R. Yamapi, G. Filatrella, C. Tchawoua
It is shown that the effect of an exponentially correlated noisy source on the escape times of a Josephson junction depends upon the noise correlation time. A careful analysis reveals that two effects are preeminent: the increase of the stability (as measured by the average escape time from the metastable state) and the increase of the extreme events in the tails of the escape time distribution. The
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Enhanced cuprate superconductivity from elongated to compressed coordination Physica C (IF 1.7) Pub Date : 2023-10-21 W.M. Li, J.F. Zhao, C.Q. Jin
In 1986 Professor Müller and Bednorz discovered the historic superconductor of LaBaCuO (La214) that opens the prelude of unprecedented era for high Tc superconductivity research worldwide. The Jahn Teller effects combining with strong interlayer Coulomb interactions lead to the elongated copper oxygen coordination in La214, giving rise to the orbital order scenario that the Cu3dx2-y2 locates near Fermi
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Shot noise in topological insulator-based ferromagnet/p-wave superconductor junctions Physica C (IF 1.7) Pub Date : 2023-10-17 Hong Li, Xinjian Yang
The differential shot noise and Fano factor in topological insulator-based ferromagnet/p-wave superconductor (TI-based FM/p-wave SC) junctions is theoretically investigated based on the Dirac-Bogoliubov-de Gennes equation. Three kinds of pairings px, py, and px+ipy-waves for SC are chosen. It is found that the shot noise spectrum strongly depends on the finite-quasi-particle lifetime, the magnetic
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High-temperature superconductivity and strange metallicity: Simple observations with (possibly) profound implications Physica C (IF 1.7) Pub Date : 2023-10-09 N.E. Hussey
Bednorz and Müller's discovery of superconductivity in the cuprate perovskite La2-xBaxCuO4 gave the modern condensed matter community arguably two of its greatest gifts – high-temperature superconductivity and strange metallicity; certainly two of its most profound and challenging problem. While it was the multi-fold increase in Tc that rightly catapulted cuprates to the summit of global media attention
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Utility applications and experience with resilient electric grid systems utilizing high temperature superconductor wires in Chicago Physica C (IF 1.7) Pub Date : 2023-10-13 M. Ross
In spring 2020, Commonwealth Edison (ComEd) in Chicago, IL broke ground on Chicago's first permanent Resilient Electric Grid System utilizing high temperature superconductor (HTS) cable after successfully achieving the US Federal Energy Regulatory Commission (FERC) approval for the classification of this being a transmission asset. This permanent grid project, commissioned in August 2021, represents
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Recent advances in the theory of the BCS–BEC crossover for fermionic superfluidity Physica C (IF 1.7) Pub Date : 2023-10-12 Giancarlo Calvanese Strinati
The BCS–BEC crossover realized experimentally with ultra-cold Fermi gases may be considered as one of the important scientific achievements occurred during the last several years. The flexibility for operating on these systems on the experimental side and the full control of the relevant system degrees of freedom on the theoretical side make quite stringent at a fundamental level the comparison between
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Thoughts on the Influence of Alex Mueller on High Magnetic Field Technology Physica C (IF 1.7) Pub Date : 2023-10-10 David C Larbalestier
I briefly summarize some of the impacts that Alex Mueller's drive to discover superconductivity in low carrier density oxides has had on high magnetic field technology, especially on the desire to use the cuprate superconductors to generate magnetic fields now almost twice those possible with the Nb-based low temperature superconductors. There were some important lessons for applications of any new
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La2−xBaxCuO4 as a superconducting Rosetta Stone Physica C (IF 1.7) Pub Date : 2023-10-11 John M. Tranquada
The high-temperature superconductivity in layered cuprates discovered by Bednorz and Müller arrived as a shock. Gradually, the presence of competing orders, such as antiferromagnetism and charge order, were discovered; however, the relationship to the superconductivity has been confusing. It so happens that the original cuprate superconductor family La2−xBaxCuO4 contains all of the relevant phases
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Spin resonances in heavy-fermion superconductors Physica C (IF 1.7) Pub Date : 2023-10-09 O. Stockert, F. Steglich
Historically heavy-fermion superconductors have been the first discovered unconventional superconductors and can to some extent be regarded as model systems for high-Tc superconductors. A hallmark of the unconventional superconductivity in high-Tc cuprates has been the observation of a spin resonance in the magnetic excitation spectrum probed by inelastic neutron scattering. We review the situation
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Particle Accelerators and Cuprate Superconductors Physica C (IF 1.7) Pub Date : 2023-10-06 Lucio Rossi
Cuprate superconductors entered into operation at the CERN LHC, the largest particle accelerator, in 2008, as part of the current leads system, a mere 20 years after the discovery by A. Mueller and G. Bednorz. The utilization of HTS for accelerator magnets faces exceptionally demanding, as yet unresolved, challenges. However, the forthcoming generation of accelerators, necessitating high magnetic field
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Material aspects of oxygen isotope effect studies in high-temperature superconductors Physica C (IF 1.7) Pub Date : 2023-10-04 K. Conder
The article discusses issues related to the material aspects of the study of the oxygen isotope effect in High-temperature superconductors. These studies were initiated by Prof. K.A. Müller shortly after he and Dr. G. Bednorz discovered high-temperature superconductivity. Research on the isotope effect was carried out in the years 1991–1995, and then continued for various classes of superconductors
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Energy-scale Considerations of Unconventional Superconductors— implications to condensation and pairing — Physica C (IF 1.7) Pub Date : 2023-09-29 Yasutomo J. Uemura
Discovery of high-Tc cuprate superconductors (HTSC) in 1986 by Bednorz and Muller, followed by synthesis of A3C60, iron-chalcogenides and other exotic superconducting (SC) systems, introduced unconventional superconductors (UCSC) having their mechanisms of condensation and/or pairing distinctly different from those of simpler metals which can be explained by BCS theory. This article will show how one
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From a superconductor to a Mott insulator: The case of granular aluminum Physica C (IF 1.7) Pub Date : 2023-09-27 Nimrod Bachar, Aviv Glezer Moshe
Understanding the nature of the metal-to-insulator in films consisting of nano-scale aluminum grains embedded in an insulating matrix, namely granular aluminum, is essential both on the fundamental level and for applications such as quantum circuits. We show how the evolution of the system from the metallic side (and superconducting at low temperatures) to the insulator side, through a Mott transition