Physica C-superconductivity and Its Applications最新文献

{"title":"Spectral domain modeling of superconducting slotline in the presence an oblique applied static magnetic field","authors":"Jolly Andrews ,&nbsp;Remya U.D. ,&nbsp;Ajith Ramachandran ,&nbsp;Joseph V.P. ,&nbsp;Vincent Mathew","doi":"10.1016/j.physc.2025.1354743","DOIUrl":"10.1016/j.physc.2025.1354743","url":null,"abstract":"<div><div>The electromagnetic response of a high temperature superconducting (HTS) slotline placed in a static magnetic field at varying oblique angles is analyzed using propagation parameters computed by spectral domain method (SDM). The modified two-fluid theory formulated by Coffey and Clem (CC) for the angular dependence is employed to self-consistently determine the vortex dynamical response of the HTS films made of different material purities. The impedance matrix of the slotline obtained using SDM is modified by incorporating the HTS contribution and Galerkin technique is used for the calculation of the propagation parameters. The paper presents the angular dependence of the obliquely angled static magnetic field on signal propagation and explains the results using vortex dynamic effects.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354743"},"PeriodicalIF":1.3,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulation of damage and critical current degradation behaviors of RRP and PIT Nb3Sn wires under transverse pressure","authors":"He Ding ,&nbsp;Lintao Li ,&nbsp;Qian Li ,&nbsp;Yuanwen Gao","doi":"10.1016/j.physc.2025.1354751","DOIUrl":"10.1016/j.physc.2025.1354751","url":null,"abstract":"<div><div>The state-of-the-art Nb₃Sn wire still exhibits discrepancies in both mechanical and superconducting critical properties when juxtaposed with the target of the requirement for superconducting wire set for future circular colliders (FCC). Intensive efforts are currently underway to develop high performance Nb₃Sn wires with enhanced mechanical and superconducting properties. In parallel, developing convenient and efficient numerical methods for comprehensively evaluating the mechanical and superconducting properties of various Nb₃Sn wires is of critical significance. Given the relevant context, the analysis of critical current degradation and fracture damage behavior of Nb₃Sn superconducting wires under transverse pressure is of significant importance. In this paper, the detailed strand numerical models are established based on the meso‑structure characteristics of Restacked-Rod-Process (RRP) and Powder-in-tube (PIT) Nb₃Sn wires at first. These models can be used to simulate stress distribution and mechanical behaviors under various external loading conditions. Subsequently, the damage and superconducting critical current degradation of epoxy-impregnated RRP and PIT wires under transverse pressure are evaluated in numerical simulations, taking into account the irreversible degradation caused by the residual plastic stress of the annealed copper matrix. This numerical method encodes all superconducting filaments/sub-elements of the two-dimensional numerical model by considering the periodic positional changes of the twisted filaments/sub-elements along the wire axis. The results indicate that within a transverse pressure range of 100 to 200 MPa, the plastic residual stress of the copper matrix is the primary cause of irreversible critical current degradation. At transverse pressure exceeding 200 MPa, the influence of damage on the critical current cannot be ignored due to the emergence of damage. When the transverse pressure reaches 413 MPa, through-thickness damage has occurred in the Nb₃Sn phase of all types RRP and PIT wires. Compared to PIT B215 wires, the critical current of RRP 108/127 wires have better strain tolerance. The numerical method with a low computational burden in this paper can conveniently evaluate the fracture and damage as well as degradation of critical properties of various Nb₃Sn wires under transverse pressure.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354751"},"PeriodicalIF":1.3,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Something about the Mechanism of Induction Phenomena: The forgotten work of Berta de Haas-Lorentz on diamagnetism in superconductors","authors":"Giulia Venditti ,&nbsp;Carlo Beenakker ,&nbsp;Louk Rademaker","doi":"10.1016/j.physc.2025.1354762","DOIUrl":"10.1016/j.physc.2025.1354762","url":null,"abstract":"<div><div>In 1925, Dr. Geertruida Luberta “Berta” de Haas-Lorentz published the paper “<em>Iets over het mechanisme van inductieverschijnselen</em>” in the journal <em>Physica</em>. Her paper was the first to discuss perfect diamagnetism of superconductors, eight years before the discovery of the Meissner effect, when the essential difference between the two phenomena was not understood. Unfortunately, her work was almost forgotten by the scientific community. To counter this, we translate her seminal 1925 paper from Dutch into English. We provide an overview of the life of Dr. De Haas-Lorentz, and comment on her pioneering contribution to the theory of superconductivity.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354762"},"PeriodicalIF":1.3,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144481246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Can dd excitations mediate pairing?” [Physica C: Superconductivity and its Applications 613 (2023) 1354321]","authors":"Francesco Barantani ,&nbsp;Christophe Berthod ,&nbsp;Dirk van der Marel","doi":"10.1016/j.physc.2025.1354753","DOIUrl":"10.1016/j.physc.2025.1354753","url":null,"abstract":"","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354753"},"PeriodicalIF":1.3,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conductivity of strongly disordered ultra-thin MoC superconducting films investigated by transmission line spectroscopy","authors":"Martin Baránek ,&nbsp;Pavol Neilinger ,&nbsp;Daniel Manca ,&nbsp;Oleg G. Turutanov ,&nbsp;Miroslav Grajcar","doi":"10.1016/j.physc.2025.1354749","DOIUrl":"10.1016/j.physc.2025.1354749","url":null,"abstract":"<div><div>The technique of non-contact broadband transmission line flip-chip spectroscopy is utilized to probe resonances of mm-sized square resonators fabricated from strongly disordered molybdenum carbide films in the GHz frequency range. The temperature dependence of the resonances was modeled by the surface impedance of the thin films via the complex conductivity of disordered superconductors, which reflects the Dynes superconducting density of states of these superconductors. The obtained Dynes broadening parameters relate reasonably well to those known from scanning tunneling spectroscopy measurements. The eigenmodes of the 2D resonator were visualized by EM model in Sonnet software.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354749"},"PeriodicalIF":1.3,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Going Dutch: Jan Zaanen and the strange metals consortium","authors":"M.P. Allan ,&nbsp;M.S. Golden ,&nbsp;N.E. Hussey ,&nbsp;K. Schalm ,&nbsp;H.T.C. Stoof ,&nbsp;E. van Heumen","doi":"10.1016/j.physc.2025.1354746","DOIUrl":"10.1016/j.physc.2025.1354746","url":null,"abstract":"<div><div>Under the visionary guidance of Jan Zaanen, a group of researchers within The Netherlands formed a consortium in 2018 to explore the physics of strange metals; its core objective to determine whether strange metals represent a novel quantum critical phase and whether this phase can be described by holographic emergence principles. The consortium itself brought together theorists working on, or at the boundaries of, the Anti-de Sitter/Conformal Field Theory (AdS/CFT) correspondence and experimentalists with collective expertise in optical conductivity, high-field magnetotransport, scanning tunneling spectroscopy (STS) and angle-resolved photoemission spectroscopy (ARPES). For reasons that will become apparent, the experimental team chose to perform their spectroscopy and transport studies on the same crystals of a single cuprate family – (Pb,Bi)₂Sr_2-<em>_x</em>La<em>_x</em>CuO₆₊<em>_δ</em> (Bi2201). Holographic signatures were indeed found in the nodal self energies observed by ARPES. Optical conductivity and magnetotransport also found evidence for the dual character of the strange metal phase, manifest in STS as a real-space differentiation into superconducting and non-superconducting regions. The evolution of the superconducting state with temperature and doping was found to be at odds with a conventional BCS picture. This compendium of the output of that consortium serves as both a tribute to Jan’s vision and perhaps, a signpost for how progress in such a complex field can be made through multiple experiments on the same material.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354746"},"PeriodicalIF":1.3,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electromagnetic analysis of coated conductors with ferromagnetic substrates: Novel insights","authors":"Vladimir Sokolovsky ,&nbsp;Leonid Prigozhin","doi":"10.1016/j.physc.2025.1354765","DOIUrl":"10.1016/j.physc.2025.1354765","url":null,"abstract":"<div><div>Ferromagnetic substrates can significantly influence the electromagnetic response of a coated conductor to an external magnetic field and transport current. This study analyzes this response theoretically using the thin shell integrodifferential model. First, assuming the substrate is strongly magnetic and the superconductor is in the Meissner state, we present the analytical solution in a convenient explicit form. This helps us to analyze the superconducting current density distributions, highlighting their differences from those in conductors with non-magnetic substrates. Second, we consider a superconducting layer characterized by a nonlinear current-voltage relation and a substrate with a finite field-independent magnetic permeability. We use an effective spectral numerical method to study the unique features of this hybrid superconductor/ferromagnet system, such as magnetization in a parallel external field and the peculiar nonmonotonic variation of loss observed when alternating transport current and parallel field are applied simultaneously. Dynamic losses for the case of a direct transport current and an alternating parallel field are also investigated. It is shown that tuning the phase and amplitude of the applied parallel field relative to those of the transport current can reduce AC losses.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354765"},"PeriodicalIF":1.3,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The inhomogeneous flow behavior of in iron-based superconducting tape production: Formation mechanism and impact on transport performance","authors":"Meng Han ,&nbsp;Chao Yao ,&nbsp;Dongliang Wang ,&nbsp;He Huang ,&nbsp;Chiheng Dong ,&nbsp;Xianping Zhang ,&nbsp;Yanwei Ma","doi":"10.1016/j.physc.2025.1354764","DOIUrl":"10.1016/j.physc.2025.1354764","url":null,"abstract":"<div><div>Iron-based superconductors (IBSs) have emerged as promising candidates for high-field applications, with various IBS wires and tapes developed through advanced fabrication techniques. However, the inhomogeneity of superconducting cores in practical conductors remains a persistent challenge, prevalent in nearly all types of powder-in-tube (PIT) superconducting tapes and significantly degrading both transport performance and mechanical properties. Here, we investigate the deformation behavior of Ba_xK_1-xFe₂As₂ (BaK122) tapes and elucidate the formation mechanism of non-uniform superconducting cores. By simulating the actual rolling process of Ag-sheathed BaK122 (BaK122/Ag) tapes, we reveal the in-situ flow behavior of the BaK122 core within the tape. The inhomogeneity of the BaK122 core arises from the plastic flow mismatch with the outer sheath during rolling, attributed to the core's lower plasticity compared to the metal sheath. The periodic characteristics of this inhomogeneous distribution are precisely identified. Furthermore, we demonstrate that rolling speed is a critical factor, with reduced rolling velocity alleviating strain rate mismatch. However, excessively low rolling speeds compromise core densification by enhancing horizontal transverse expansion. An optimal rolling velocity exists to balance uniformity and densification of the BaK122 core. Using the BaK122/Ag tape as a model system, we determine and experimentally validate this optimal rolling velocity through a series of studies, particularly via superconducting transport current measurements. Our findings provide essential guidance for achieving uniform fabrication of heterogeneous composites, such as high-temperature superconducting tapes.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354764"},"PeriodicalIF":1.3,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of the Halbach permanent magnet guideway in HTS maglev based on sensitivity analysis","authors":"Tianyu Xing ,&nbsp;Jinkai Zhang ,&nbsp;Yan Li ,&nbsp;Can Peng ,&nbsp;Peiyu Yin ,&nbsp;Zigang Deng","doi":"10.1016/j.physc.2025.1354761","DOIUrl":"10.1016/j.physc.2025.1354761","url":null,"abstract":"<div><div>As an important part of the high-temperature superconducting (HTS) maglev system, the performance and stability of the permanent magnet guideway (PMG) is directly related to the loading capacity and safe operation of the HTS maglev train. Therefore, it is necessary to carry out optimization research on the performance of PMG. At present, PMG optimization studies are mostly from the perspective of magnetic circuit, and seldom considered from the perspective of statistical analysis. In this paper, a PMG optimization method based on sensitivity analysis is discussed. First, the PMG dataset is established by simulation with parametric sweeping method. Then, the influence of permanent magnet (PM) dimension and grade on the electromagnetic force of HTS maglev system is investigated using sensitivity analysis method. And the optimization suggestions for the HTS maglev system are given. Finally, the optimization method is applied to present a PMG optimization case, and the optimization results show that the maximum vertical magnetic field is increased by 16.57 %, the maximum lateral magnetic field is increased by 10.97 %, the levitation force of the HTS bulks is increased by 3.23 %, and the guidance force is increased by 11.78 %.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354761"},"PeriodicalIF":1.3,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144588738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spin-triplet f-wave pairing via cyclic exchange in the anisotropic triangular Hubbard model: A route to unconventional superconductivity","authors":"S. Nishimoto ,&nbsp;Y. Ohta","doi":"10.1016/j.physc.2025.1354742","DOIUrl":"10.1016/j.physc.2025.1354742","url":null,"abstract":"<div><div>We investigate the interplay between ferromagnetism and unconventional superconductivity in a two-dimensional anisotropic triangular-lattice Hubbard model using the density-matrix renormalization group (DMRG) method. A novel mechanism for spin-triplet <em>f</em>-wave superconductivity is identified, driven by three-site cyclic-exchange interactions. This mechanism highlights the crucial role of lattice anisotropy and triangular hopping networks in stabilizing ferromagnetic correlations necessary for spin-triplet pairing. The slow decay of pair-correlation functions and their sign change under a <span><math><mrow><mi>π</mi><mo>/</mo><mn>3</mn></mrow></math></span> rotation confirm the dominant <em>f</em>-wave symmetry of the superconducting state. These findings offer a unified theoretical framework for understanding unconventional superconductivity in strongly correlated electron systems, with potential relevance to materials such as Bechgaard salts <span><math><mrow><msub><mrow><mrow><mo>(</mo><mtext>TMTSF</mtext><mo>)</mo></mrow></mrow><mrow><mn>2</mn></mrow></msub><mtext>X</mtext></mrow></math></span>, cobalt oxide <span><math><mrow><msub><mrow><mtext>Na</mtext></mrow><mrow><mn>0</mn><mo>.</mo><mn>35</mn></mrow></msub><msub><mrow><mtext>CoO</mtext></mrow><mrow><mn>2</mn></mrow></msub><mi>⋅</mi><mn>1</mn><mo>.</mo><mn>3</mn><msub><mrow><mtext>H</mtext></mrow><mrow><mn>2</mn></mrow></msub><mtext>O</mtext></mrow></math></span>, and layered perovskite <span><math><mrow><msub><mrow><mtext>Sr</mtext></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mtext>RuO</mtext></mrow><mrow><mn>4</mn></mrow></msub></mrow></math></span>.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354742"},"PeriodicalIF":1.3,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}