Superconductivity最新文献

Baihua: A 100-qubit scale, high-performance, and open-access quantum cloud platform 百花：100量子位规模、高性能、开放接入的量子云平台

IF 6.2

Superconductivity Pub Date : 2025-10-09 DOI: 10.1016/j.supcon.2025.100206

Pei Liu , Wen-Gang Zhang , Jia-Jia Tian , Yi-Bin Guo , Hai-Feng Yu , Yi-Rong Jin

引用次数: 0

Extended hydrogen frameworks in nonmetallic superhydrides enabling 190 K superconductivity 非金属超氢化物中的扩展氢框架实现190k超导性

IF 6.2

Superconductivity Pub Date : 2025-09-01 DOI: 10.1016/j.supcon.2025.100196

Qiuyue Li , Shuai Han , Xiaohua Zhang , Shicong Ding , Aitor Bergara , Guochun Yang

{"title":"Extended hydrogen frameworks in nonmetallic superhydrides enabling 190 K superconductivity","authors":"Qiuyue Li , Shuai Han , Xiaohua Zhang , Shicong Ding , Aitor Bergara , Guochun Yang","doi":"10.1016/j.supcon.2025.100196","DOIUrl":"10.1016/j.supcon.2025.100196","url":null,"abstract":"<div><div>Extended hydrogen-rich frameworks stabilized under high pressure are essential for achieving high-temperature superconductivity in metal hydrides, where metal atoms contribute both charge and intrinsic precompression. In contrast, <em>p</em>-block nonmetal hydrides lack such extended hydrogenic connectivity. Here, using first-principles crystal structure search calculations, we identify three nitrogen-based superhydrides—NH<sub>10</sub>, NH<sub>11</sub>, and NH<sub>12</sub>—each featuring a unique extended H sublattice: corrugated graphene-like hydrogen layers in NH<sub>10</sub>, planar H<span><math><msub><mrow></mrow><mrow><mn>16</mn></mrow></msub></math></span>-ring sheets in NH<sub>11</sub>, and a fully three-dimensional, densely connected H framework in NH<sub>12</sub>. These structures are stabilized by <span><math><msup><mrow><msub><mrow><mi>NH</mi></mrow><mrow><mn>4</mn></mrow></msub></mrow><mrow><mo>+</mo></mrow></msup></math></span> units, which donate charge in a manner analogous to metal atoms in conventional metal superhydrides. Remarkably, NH<sub>10</sub> exhibits a superconducting critical temperature (<span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>) of 190K at 200GPa, driven by strong electron–phonon coupling between H-1<em>s</em> states and low-frequency hydrogen-derived phonon modes—a mechanism notably distinct from that of hydrogen cages in LaH<sub>10</sub> and CaH<sub>6</sub>. The predicted <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> values of NH<sub>11</sub> and NH<sub>12</sub> also exceeds 130 K. Our work introduces a new paradigm for designing nonmetal superhydrides with structurally engineered hydrogenic frameworks.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"15 ","pages":"Article 100196"},"PeriodicalIF":6.2,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145094879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Superconducting magnets for high power microwave systems: Performance enhancement and future prospects 用于高功率微波系统的超导磁体：性能增强和未来展望

IF 6.2

Superconductivity Pub Date : 2025-09-01 DOI: 10.1016/j.supcon.2025.100194

Zhiqiang Fan

引用次数: 0

Superconducting fault current limiter for multi-terminal HVDC grid protection 多端直流电网保护超导故障限流器

IF 6.2

Superconductivity Pub Date : 2025-09-01 DOI: 10.1016/j.supcon.2025.100195

Wenxin Li , Ying Xin

引用次数: 0

A low-resistance joint of REBCO stacked cable for large-scale superconducting magnets 大型超导磁体用REBCO叠层电缆低阻接头

IF 6.2

Superconductivity Pub Date : 2025-08-19 DOI: 10.1016/j.supcon.2025.100191

Jialong Zhang , Peng Song , Binbin Wang , Yulong Liu , Cedric Korte , Timing Qu

{"title":"A low-resistance joint of REBCO stacked cable for large-scale superconducting magnets","authors":"Jialong Zhang , Peng Song , Binbin Wang , Yulong Liu , Cedric Korte , Timing Qu","doi":"10.1016/j.supcon.2025.100191","DOIUrl":"10.1016/j.supcon.2025.100191","url":null,"abstract":"<div><div>The integration of REBCO superconducting coils into compact tokamak toroidal field magnets represents a transformative advancement in fusion technology. In the fabrication of these magnets, electrical connections between pancake coils are typically established through a transverse bridging joint, the performance of which critically impacts device efficiency. To address the demand for enhanced connectivity, this study presents a novel bridge-type “stacked joint” utilizing a superconducting-copper composite structure, optimized for inter-coil connections of stacked REBCO cables. Leveraging a modular stacking approach and low-temperature soldering, this design achieves a resistance as low as 1 <span><math><mrow><mi>n</mi><mi>Ω</mi></mrow></math></span> over a 10 cm length alongside a soldering resistivity below 25 <span><math><mrow><mi>n</mi><mi>Ω</mi><mspace></mspace><msup><mrow><mi>cm</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math></span> in a liquid nitrogen (77 K) self-field environment. The study further investigates the impact of tape length and quantity on joint electrical performance under this configuration. Rigorous testing, including 10 thermal cycles (77 K to room temperature) and pressure loads up to 30 MPa, confirms the joint’s structural reliability and the consistency of the fabrication process, underscoring its potential for fusion applications.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"15 ","pages":"Article 100191"},"PeriodicalIF":6.2,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analytical model for coupling loss in filamentized high-temperature superconducting tapes 丝状高温超导带耦合损耗的解析模型

IF 6.2

Superconductivity Pub Date : 2025-08-18 DOI: 10.1016/j.supcon.2025.100193

F. Gömöry , J. Šouc , M. Solovyov , S. Landvogt , M. Pekarčíková , C.R.H. Bahl , A.C. Wulff

{"title":"Analytical model for coupling loss in filamentized high-temperature superconducting tapes","authors":"F. Gömöry , J. Šouc , M. Solovyov , S. Landvogt , M. Pekarčíková , C.R.H. Bahl , A.C. Wulff","doi":"10.1016/j.supcon.2025.100193","DOIUrl":"10.1016/j.supcon.2025.100193","url":null,"abstract":"<div><div>Composite wires containing superconducting filaments embedded in a metallic matrix are used in various applications. In the presence of time-varying magnetic fields, electrical currents are induced in the loops where superconductor and normal metal regions are connected in series, causing energy dissipation known as coupling loss. Commonly accepted analytical formulas provide a basic understanding of this phenomenon. Recently, tape-shaped conductors containing a single layer of high-temperature superconductor striated in several parallel filaments have gained attention for use in nuclear fusion reactors, particle accelerators, and motors. It was found that, in spite of a dissimilar geometry, the analytical formulas deduced for round composites provide a fair qualitative interpretation of the experimental data obtained for this new kind of conductor. However, because of the used postulation of uniform local magnetic field, these models cannot correctly predict the dissipation near the peak in frequency dependence. We derived an analytical model starting from the assumption of an exponential decrease of magnetic field from the tape ends towards its center. This model is free of fitting parameters, with the peak dissipation controlled by the tape width only. Compared to previous models, it predicts <span><math><mo>∼</mo></math></span>40% lower peak loss. We demonstrate its decent agreement with experiments.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"15 ","pages":"Article 100193"},"PeriodicalIF":6.2,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144885928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High performance multifactorial designs based on a refined analytical method for HTS maglev systems 基于精细分析方法的高温超导磁悬浮系统高性能多因素设计

IF 6.2

Superconductivity Pub Date : 2025-08-06 DOI: 10.1016/j.supcon.2025.100190

Xiaoning Liu , Zigang Deng , Zhihao Ke , Yuqiong Wang , Xiangyu Tian

{"title":"High performance multifactorial designs based on a refined analytical method for HTS maglev systems","authors":"Xiaoning Liu , Zigang Deng , Zhihao Ke , Yuqiong Wang , Xiangyu Tian","doi":"10.1016/j.supcon.2025.100190","DOIUrl":"10.1016/j.supcon.2025.100190","url":null,"abstract":"<div><div>YBa<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Cu<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>O<span><math><msub><mrow></mrow><mrow><mn>7</mn><mo>−</mo><mi>δ</mi></mrow></msub></math></span> high-temperature superconductors (HTS) exhibit remarkable passive levitation over permanent magnet guideways (PMG), but the strong nonlinearity poses significant challenges for developing analytical models for HTS maglev systems. This paper presents a refined analytical method for calculating the electromagnetic force in such systems. The method incorporates critical factors, including the complex properties of the superconductors, the Halbach PMG geometry, and various operation conditions. The derived analytical expressions explicitly reveal the interplay between system parameters and levitation performance. Experimental and numerical validation confirms the model’s high prediction accuracy in magnetic fields, levitation and guidance forces. A sensitivity analysis further identifies the most influential parameters such as thickness of the magnet, levitation height, Halbach wavelength. Moreover, this paper calculates and provides the recommended structural parameters for both rare-earth and rare-earth-free PMG. The potential of HTS maglev systems for heavy-haul applications is explored, demonstrating the capability to achieve significant levitation force (about 50 ton/m) under constrained geometric conditions. This work provides critical insights for minimizing permanent magnet consumption in HTS maglev systems and circumventing rare-earth material constraints.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"15 ","pages":"Article 100190"},"PeriodicalIF":6.2,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144852627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High temperature superconductor coated conductors: A highly complex system where the only way is ‘ups’ 高温超导体涂层导体：一个高度复杂的系统，唯一的方法是“向上”。

IF 6.2

Superconductivity Pub Date : 2025-08-05 DOI: 10.1016/j.supcon.2025.100189

J.L. MacManus-Driscoll

引用次数: 0

Pressure-driven charge transfer and tunable superconductivity in intermetallic Li–Mg electrides 金属间锂-镁电子的压力驱动电荷转移和可调谐超导性

IF 6.2

Superconductivity Pub Date : 2025-07-16 DOI: 10.1016/j.supcon.2025.100187

Shuai Han , Aitor Bergara , Xiaohua Zhang , Shicong Ding , Fei Li , Guochun Yang

{"title":"Pressure-driven charge transfer and tunable superconductivity in intermetallic Li–Mg electrides","authors":"Shuai Han , Aitor Bergara , Xiaohua Zhang , Shicong Ding , Fei Li , Guochun Yang","doi":"10.1016/j.supcon.2025.100187","DOIUrl":"10.1016/j.supcon.2025.100187","url":null,"abstract":"<div><div>Electrides, materials in which a portion of valence electrons reside as interstitial anionic electrons (IAEs) within lattice cavities—exhibit a wide range of extraordinary physical and chemical properties, making them a central focus of condensed matter physics. Under high pressure, intermetallic systems provide a unique pathway to novel electrides by enabling unconventional charge-transfer mechanisms. Here, we employ first-principles structure searches to identify two stable Li-Mg electrides, Li<sub>3</sub>Mg and Li<sub>4</sub>Mg. At low pressure, Mg atoms act as anionic centers through occupation of their outer-shell 3<em>p</em> orbitals. Upon compression, charge is transferred from Mg to the lattice cavities, enhancing the localization and density of IAEs. This, in turn, strengths electron–phonon coupling and raises the superconducting transition temperature (<span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>) to 13.3 K at 75 GPa for Li<sub>3</sub>Mg and 19.7 K at 80 GPa for Li<sub>4</sub>Mg—values that surpass most known electride superconductors below 100 GPa. Selective hydrogen insertion into the lattice cavities in Li<sub>4</sub>Mg quenches the IAEs and confirms their essential role in superconductivity. Further compression drives a transition to poor or non-superconducting phases, with Mg atoms switching from electron acceptors to donors, contrary to the typical behavior of electropositive metals, which tend to transition from donors into acceptors under pressure. These findings highlight the pivotal role of IAEs in electride superconductivity and pave the way for designing novel intermetallic electrides with tunable properties.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"15 ","pages":"Article 100187"},"PeriodicalIF":6.2,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144722357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Critical current degradation of REBCO coated conductor tapes caused by multiple cracks under tensile loading 拉伸载荷下多重裂纹引起的REBCO涂层导体带临界电流退化

IF 5.6

Superconductivity Pub Date : 2025-07-14 DOI: 10.1016/j.supcon.2025.100185

Zhirong Yang , Peng Song , Feng Feng , Timing Qu

{"title":"Critical current degradation of REBCO coated conductor tapes caused by multiple cracks under tensile loading","authors":"Zhirong Yang , Peng Song , Feng Feng , Timing Qu","doi":"10.1016/j.supcon.2025.100185","DOIUrl":"10.1016/j.supcon.2025.100185","url":null,"abstract":"<div><div>REBa<sub>2</sub>Cu<sub>3</sub>O<sub>x</sub> (REBCO) coated conductors exhibit irreversible critical current (<span><math><msub><mrow><mi>I</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>) degradation under tensile strain beyond the irreversible strain (<span><math><msub><mrow><mi>ɛ</mi></mrow><mrow><mi>irr</mi></mrow></msub></math></span>). While this degradation is attributed to cracking, the specific crack evolution process and its quantitative relation to <span><math><msub><mrow><mi>I</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> degradation remain unclear. Here, the multiplication of cracks in REBCO tapes under tensile is characterized. It was found that surface particles disrupt continuous crack propagation, causing fragmentation of the REBCO layer. A shear lag model describes how the stress distribution evolves with fragmentation spacing. A probabilistic fracture model then predicts the two-regime spacing reduction as a function of applied strain. The discontinuous crack network acts as the residual flow channel for current once strain exceeds <span><math><msub><mrow><mi>ɛ</mi></mrow><mrow><mi>irr</mi></mrow></msub></math></span>. Crack spacing determines the remaining <span><math><msub><mrow><mi>I</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> in this regime. An analytical model is thus proposed to capture the <span><math><msub><mrow><mi>I</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> degradation behavior based on the quantified fragmentation process. Additionally, this study suggests approaches to obtain a wider safe operating strain range through tailoring of the fracture behavior, expanding the practical application limits. This work provides new insights into the progressive cracking mechanisms governing irreversible <span><math><msub><mrow><mi>I</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> degradation in strained REBCO tapes.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"15 ","pages":"Article 100185"},"PeriodicalIF":5.6,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144712905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0