Physica C-superconductivity and Its Applications最新文献

{"title":"Research on the HTS joint for 10kA-level CORC cable with forced-flow cooling","authors":"Yuan Cheng ,&nbsp;Jinxing Zheng ,&nbsp;Ming Li ,&nbsp;Shaotao Dai ,&nbsp;Tao Ma","doi":"10.1016/j.physc.2025.1354731","DOIUrl":"10.1016/j.physc.2025.1354731","url":null,"abstract":"<div><div>Due to the high critical current and excellent flexibility in winding, Conductor on Round Core (CORC) cable had become one of the most ideal basic units for constructing high-temperature superconducting (HTS) coils. Under conditions of rapid current and magnetic field variations, the cables experience hysteresis losses in ReBCO tapes and eddy current losses in the copper tubes. Forced-flow cooling method could remove heat in time, thereby maintaining the temperature of the tapes. So for large-scale scientific devices such as magnet system of the accelerators, forced-flow inside the tubes has become the most efficient cooling method. However, in the manufacture of HTS magnets, it is common practice to solder the ends of the cables to copper blocks to prepare joints. This method is only suitable for immersion or conduction cooling. Therefore, the development of an HTS joint capable of meeting the forced-flow cooling requirements of the CORC cable becomes essential. This article proposes a novel HTS joint design, which can realize double-channel forced flow cooling for CORC cable. The ReBCO tapes can be directly in contact with liquid helium. The joint resistance at 4.5 K is 25.3 nΩ. Through thermal-hydraulic analysis, with the implementation of the joint designed in this article, at 3.5 T, the minimum quench energy (MQE) of double-channel forced-flow cooling cable is 220.12 J for long disturbance, significantly higher than that of single-channel forced-flow cooling cable. These results demonstrate that the joint developed in this article markedly improves the operational stability of the CORC cable.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354731"},"PeriodicalIF":1.3,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916158","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":"Influence of growth parameters on the superconducting transition temperature in granular aluminum films","authors":"Aniruddha Deshpande,&nbsp;Jan Pusskeiler,&nbsp;Christian Prange,&nbsp;Uwe Rogge,&nbsp;Martin Dressel,&nbsp;Marc Scheffler","doi":"10.1016/j.physc.2025.1354709","DOIUrl":"10.1016/j.physc.2025.1354709","url":null,"abstract":"<div><div>This study investigates the influence of various growth parameters on normal-state resistivity and superconducting transition temperature <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> of granular aluminum films. Specifically, we focus on the effects of oxygen flow and aluminum evaporation rate during the growth process conducted at different substrate temperatures, from 300 K down to 25 K. We report systematic correlations between the growth conditions, the normal-state resistivity, and <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>. Furthermore, our findings provide insights into optimizing the superconducting characteristics of granular aluminum.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354709"},"PeriodicalIF":1.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923238","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":"Stripe-like correlations in the cuprates from oxygen NMR","authors":"Daniel Bandur ,&nbsp;Abigail Lee ,&nbsp;Stefan Tsankov ,&nbsp;Andreas Erb ,&nbsp;Jürgen Haase","doi":"10.1016/j.physc.2025.1354722","DOIUrl":"10.1016/j.physc.2025.1354722","url":null,"abstract":"<div><div>Nuclear magnetic resonance (NMR) of planar oxygen, with its family independent phenomenology, is ideally suited to probe the nature of the quantum matter of superconducting cuprates. Here, with new experiments on La<span><math><msub><mrow></mrow><mrow><mn>2</mn><mo>−</mo><mi>x</mi></mrow></msub></math></span>Sr<span><math><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span>CuO<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span>, in particular also at high doping levels, we report on short-range stripe-like correlations between local charge and spin. The amplitudes of the spin and charge variations at room temperature are nearly independent of doping up to at least <span><math><mrow><mi>x</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>30</mn></mrow></math></span>. However, the correlation is inverted upon passing <span><math><mrow><mi>x</mi><mo>=</mo><mn>1</mn><mo>/</mo><mn>4</mn></mrow></math></span>. Despite the atomic scale length, the variations still resemble the average spin and charge relation. Literature data show the correlations to be generic to the cuprates.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354722"},"PeriodicalIF":1.3,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143900335","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":"Concealed Mott criticality: Unifying the Kondo breakdown and doped charge-transfer insulators","authors":"Louk Rademaker","doi":"10.1016/j.physc.2025.1354720","DOIUrl":"10.1016/j.physc.2025.1354720","url":null,"abstract":"<div><div>I show that the quantum critical points observed in heavy fermions (the ‘Kondo breakdown’) and in doped cuprates can be understood in terms of concealed Mott criticality. In this picture, one species of electrons undergoes a Mott localization transition, in the presence of metallic charge carries. As is shown in a simple toy model, this results in a Fermi surface jump at the transition, as well as mass enhancement on both the ‘large’ and ‘small’ Fermi surface side of the transition, consistent with the experimental observations.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354720"},"PeriodicalIF":1.3,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887603","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":"Emergent Bose liquid: A generic quantum state of matter alternative to Fermi liquid","authors":"Zi-Jian Lang ,&nbsp;Anthony Hegg ,&nbsp;Yucel Yildirim ,&nbsp;Shengtao Jiang ,&nbsp;Long Zou ,&nbsp;Xinlei Yue ,&nbsp;Tao Zeng ,&nbsp;Jinning Hou ,&nbsp;Wei Ku","doi":"10.1016/j.physc.2025.1354723","DOIUrl":"10.1016/j.physc.2025.1354723","url":null,"abstract":"<div><div>With continuous success in understanding and predicting experimental results in various materials, Fermi liquid theory has undoubtedly been demonstrated to be the cornerstone of modern condensed matter physics. However, the applicability of this theory was challenged by the observation non-Fermi-liquid behaviors in strongly correlated materials. Here, we introduce a different quantum state of matter, namely an emergent Bose liquid formed from tightly bound pairs of neighboring fermions. Many features of this emergent Bose liquid, including transport properties, superconducting phase and critical points, Bose metal phase, non-Fermi-liquid scattering rate, pseudogap, and superconducting gap, all demonstrate qualitatively different behavior from Fermi liquid. Surprisingly, from room temperature down to the low-temperature limit and from the low-density to the high-density regime, we find good semi-quantitative agreement with (and simple explanations for) many observations without introducing free parameters beyond the initial tight-binding coefficients. Producing such a broad agreement with experiments from a single emergent Bose liquid model strongly supports this alternative quantum state of matter for understanding the physics of strongly correlated materials.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354723"},"PeriodicalIF":1.3,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916159","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":"Mixed-symmetry superconductivity and the energy gap","authors":"P. Senarath Yapa ,&nbsp;X. Guo ,&nbsp;J. Maciejko ,&nbsp;F. Marsiglio","doi":"10.1016/j.physc.2025.1354719","DOIUrl":"10.1016/j.physc.2025.1354719","url":null,"abstract":"<div><div>The symmetry of the superconducting order parameter, or simply the “gap”, provides certain constraints on the actual mechanism that gives rise to pairing and ultimately to superconductivity. In this work we show how superconducting phases with mixed singlet-triplet symmetries can arise below <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> for a generic tight-binding model. We first examine the 1D case to better illustrate the prevalence of symmetry-breaking transitions below <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>, and then the more realistic 2D case. In both cases we illustrate the implication for spectroscopic investigations of the energy gap by calculating the density of states for different temperatures below <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>. We find that the structure of the density of states near <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> can vary dramatically from its form near <span><math><mrow><mi>T</mi><mo>=</mo><mn>0</mn></mrow></math></span>. A complete picture of the superconducting symmetry can only be attained if measurements are made over the entire temperature range.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354719"},"PeriodicalIF":1.3,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904196","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":"Elastoplastic contact behavior of multi-stage superconducting cables under tension","authors":"Zhiwen Zhou,&nbsp;Sitongyan Li,&nbsp;Zhiwen Gao","doi":"10.1016/j.physc.2025.1354727","DOIUrl":"10.1016/j.physc.2025.1354727","url":null,"abstract":"<div><div>The superconductor cable with multi-stage twisted strands is a key component in the International Thermonuclear Experimental Reactor. These superconducting strands are composite materials with a complex microstructure. In the study, an elastoplastic constitutive model incorporating both isotropic and kinematic hardening is established to investigate the mechanical properties of the strands. The model is implemented as a user-defined material subroutine (UMAT) in the commercial finite element code ABAQUS using the fully implicit backward Euler method. Based on the analysis of the elastoplastic properties of the strands, a numerical contact model is developed to predict the contact characteristics of the multi-stage superconducting cable. The influence of helical pitch on the contact characteristics is examined by integrating the elastoplastic constitutive relations of the strands with their hierarchical helical structures. Numerical results demonstrate that the proposed model accurately describes the contact characteristics of the multi-stage superconducting cable. It is noteworthy that the elastoplastic contact force is found to be smaller than the elastic contact force. This elastoplastic contact model can be effectively used to predict the degradation of critical current in the multi-stage superconducting cable due to tensile loads.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354727"},"PeriodicalIF":1.3,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859871","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":"Delamination behaviour of the meter‐long class Fe(Se,Te) coated conductor tapes","authors":"Han Yang ,&nbsp;Fang Liu ,&nbsp;Hongjun Ma ,&nbsp;Zhenchuang Zhang ,&nbsp;Xiao Liu ,&nbsp;Shu Tao ,&nbsp;Ziming Wang ,&nbsp;Huan Jin ,&nbsp;Jinggang Qin ,&nbsp;Huajun Liu ,&nbsp;Chao Zhou","doi":"10.1016/j.physc.2025.1354728","DOIUrl":"10.1016/j.physc.2025.1354728","url":null,"abstract":"<div><div>FeSeTe coated conductor (CC) tapes have garnered significant attention due to their simple crystal structure, straightforward preparation process, elimination of the need for heat treatment, and the absence of the toxic element arsenic (As). The material's development is progressing favorably, with the successful production of meter-long class tapes. To facilitate its broader application, this study investigates the transverse delamination strength of FeSeTe CC tapes, with a particular focus on the impact of temperature and the location of delamination occurrences. The mechanical delamination tests were conducted using the anvil method, while the microstructure of the fracture surfaces was analyzed using transmission electron microscopy (TEM). The results indicate that the average transverse delamination strength of copper electroplated tapes at room temperature (RT) is 1.77 MPa, which decreases significantly to 0.74 MPa at 77 K, highlighting the substantial impact of low temperature on the mechanical properties of the tapes. TEM analysis revealed that most delamination occurs at the superconductor layer. These findings provide valuable insights for optimizing the mechanical performance of FeSeTe CC tapes for practical applications.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354728"},"PeriodicalIF":1.3,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144194696","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":"Praseodymium doping effect on the superconducting properties of FeSe0.5Te0.5 bulks under ambient and high-pressure growth conditions","authors":"Priya Singh ,&nbsp;Manasa Manasa ,&nbsp;Mohammad Azam ,&nbsp;Tatiana Zajarniuk ,&nbsp;Svitlana Stelmakh ,&nbsp;Taras Palasyuk ,&nbsp;Jan Mizeracki ,&nbsp;Tomasz Cetner ,&nbsp;Andrzej Morawski ,&nbsp;Cezariusz Jastrzębski ,&nbsp;Michał Wierzbicki ,&nbsp;Shiv J. Singh","doi":"10.1016/j.physc.2025.1354729","DOIUrl":"10.1016/j.physc.2025.1354729","url":null,"abstract":"<div><div>A series of Pr-doped FeSe_0.5Te_0.5 (Fe_1-<em>_x</em>Pr<em>_x</em>Se_0.5Te_0.5; <em>x</em> = 0 to 0.3) bulks are prepared by conventional synthesis process at ambient pressure (CSP), and high gas pressure and high temperature synthesis (HP-HTS) methods. These bulks are well characterized by structural and microstructural analysis, Raman spectroscopy, transport, and magnetic measurements. The HP-HTS process of the parent bulks has enhanced the onset transition temperature (<em>T_c^onset</em>) by 1.5 K and the critical current density (<em>J_c</em>) by two orders of magnitude compared to the CSP method. Pr-doped FeSe_0.5Te_0.5 up to 10 % doping content prepared, either CSP or HP-HTS, slightly increases the unit cell volume, and high-pressure growth produces an almost pure superconducting phase, which confirms the successful Pr-doping at Fe sites. Raman spectroscopy measurements and DFT calculations suggest the substitution of Pr-atoms in the interlayer spacing of Fe(Se,Te) lattice. High-pressure growth of Fe_1-<em>_x</em>Pr<em>_x</em>Se_0.5Te_0.5 also makes the sample less dense compared to the parent sample grown by HP-HTS. Transport and magnetic measurements depict that <em>T_c^onset</em> is almost unaffected by Pr-doping, whereas <em>J_c</em> of Pr-doped FeSe_0.5Te_0.5 is enhanced by one order of magnitude relative to the parent sample developed by CSP but lower than that of the parent sample grown by HP-HTS. Hence, Pr- doping at Fe sites preserves <em>T_c^onset</em> and improves <em>J_c</em> of FeSe_0.5Te_0.5 regardless of the doping contents and growth conditions. These results are promising for the practical application of iron-based superconductors to improve <em>J_c</em> properties without affecting <em>T_c^onset</em> through CSP process and congruent with discoveries from other superconductors, like cuprates and MgB₂.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354729"},"PeriodicalIF":1.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143869290","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":"Glassy relaxation and weak vortex pinning in anisotropic (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 single crystals","authors":"N. Haberkorn ,&nbsp;Yong Seung Kwon","doi":"10.1016/j.physc.2025.1354726","DOIUrl":"10.1016/j.physc.2025.1354726","url":null,"abstract":"<div><div>We present a comprehensive study on the vortex dynamics of (Ca_0.85La_0.15)₁₀(Pt₃As₈)(Fe₂As₂)₅ ​ single crystals, characterized by magnetization measurements. With a superconducting critical temperature of 32 K, this material is notable for its substantial anisotropy (5–6), which significantly influences the intrinsic vortex fluctuations. Our results reveal low critical current densities, i. e. <em>J_c</em>∼0.6 MA/cm² at 1.8 K and low magnetic fields. The magnetic field dependences of <em>J_c</em> exhibit a fishtail or second peak in the magnetization, a feature commonly associated with weak vortex pinning and vortex relaxation crossovers. Moreover, the flux creep rates are exceptionally large at low fields and temperatures. Through Maley’s analysis, we extract low vortex pinning energies (∼50 K) and glassy exponents that are consistent with expectations for single-vortex pinning, progressively evolving towards vortex bundles. These findings enhance our understanding of vortex dynamics in iron-based superconductors, highlighting the key role of intrinsic vortex fluctuations in the vortex phase diagram.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354726"},"PeriodicalIF":1.3,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878676","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}