Superconductivity最新文献_第3页

Single-gap two-band superconductivity well above the Pauli limit in non-centrosymmetric TaIr2B2 在非中心对称的TaIr2B2中，单间隙双带超导性远高于泡利极限

IF 5.6

Superconductivity Pub Date : 2025-04-03 DOI: 10.1016/j.supcon.2025.100167

J. Kačmarčík , Z. Pribulová , T. Shiroka , F. Košuth , P. Szabó , M.J. Winiarski , S. Królak , J. Jaroszynski , T. Shang , R.J. Cava , C. Marcenat , T. Klein , T. Klimczuk , P. Samuely

{"title":"Single-gap two-band superconductivity well above the Pauli limit in non-centrosymmetric TaIr2B2","authors":"J. Kačmarčík , Z. Pribulová , T. Shiroka , F. Košuth , P. Szabó , M.J. Winiarski , S. Królak , J. Jaroszynski , T. Shang , R.J. Cava , C. Marcenat , T. Klein , T. Klimczuk , P. Samuely","doi":"10.1016/j.supcon.2025.100167","DOIUrl":"10.1016/j.supcon.2025.100167","url":null,"abstract":"<div><div>Non-centrosymmetric superconducting materials represent an exciting class of novel superconductors featuring a variety of unconventional properties, including mixed-parity pairing and very high upper critical fields. Here, we present a comprehensive study of TaIr<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>B<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> (with <span><math><mrow><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>=</mo><mn>5</mn><mo>.</mo><mn>1</mn></mrow></math></span>\u0000 K), using a set of complementary experimental methods, including bulk- and surface-sensitive techniques. We provide evidence that this system is a two-band, yet it behaves as a single-gap superconductor with a strong coupling. The upper critical field of TaIr<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>B<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> significantly exceeds the Pauli limit and exhibits a nearly linear temperature dependence down to the lowest temperatures. This behavior, rarely seen in superconductors, is discussed in terms of anti-symmetric spin–orbit interaction, two-band-, and strong-coupling effects, as well as disorder.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"14 ","pages":"Article 100167"},"PeriodicalIF":5.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860392","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

Hysteresis loss scaling of round REBCO cable towards 20 T 圆形REBCO电缆滞回损耗向20t方向缩放

IF 5.6

Superconductivity Pub Date : 2025-03-26 DOI: 10.1016/j.supcon.2025.100165

Arend Nijhuis , Ruben Lubkemann , Gulio Annaballi , Huan Jin , Zichuan Guo , Jinggang Qin , Chao Zhou

{"title":"Hysteresis loss scaling of round REBCO cable towards 20 T","authors":"Arend Nijhuis , Ruben Lubkemann , Gulio Annaballi , Huan Jin , Zichuan Guo , Jinggang Qin , Chao Zhou","doi":"10.1016/j.supcon.2025.100165","DOIUrl":"10.1016/j.supcon.2025.100165","url":null,"abstract":"<div><div>High Temperature Superconductor (HTS) cables are considered for use in tokamaks such as DEMO (EU) and Chinese next generation fusion device (CN) or compact fusion machines. HTS cables offer the advantage of increased operating temperature and field strength of the magnet coils. In particular for Central Solenoid (CS) coils, the HTS high current cabled conductor windings are exposed to fast ramping AC magnetic fields inducing AC losses. The AC loss in HTS cables for fusion is mainly explored at low magnetic field amplitudes due to lack of testing facilities at higher fields. However, since the operating field in CS coils may be up to 20 T, it is essential to obtain quantitative knowledge on the AC losses for the entire applied field range with reasonable accuracy. This is important for thermohydraulic analysis of the operating temperature margin in coil designs. A method is used here to scale the hysteresis loss of a REBCO cable without transport current, measured up to only 1.4 T, to the entire field and temperature range up to 20 T and 50 K respectively. The field shielding and penetration effects of a multi-layer REBCO CORC®-like cable are quantified by measurements on stacked tape samples with a Vibrating Sample Magnetometer (VSM) up to fields significantly higher than the round cable’s full penetration field, found to be at 4.2 T. For higher fields, using measured critical current (<span><math><msub><mrow><mi>I</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>) data up to 19 T and an <span><math><msub><mrow><mi>I</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>(<em>B</em>,<em>T</em>) scaling law for field (<em>B</em>) and temperature (<em>T</em>) serve to cover the required range of data within the window of coil operation parameters. Basic well-known theory on AC loss, particularly on the relation between hysteresis loss and critical current density against magnetic field, serves as a validation for this work.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"14 ","pages":"Article 100165"},"PeriodicalIF":5.6,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833790","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

Multiphysics multilayer modelling and simulation of HTS REBCO magnets carrying direct currents under AC magnetic fields 交流磁场下承载直流电的 HTS REBCO 磁体的多物理多层建模与仿真

IF 5.6

Superconductivity Pub Date : 2025-03-18 DOI: 10.1016/j.supcon.2025.100157

Xuezhi Luo , Jun Ma , Huaqian Xiao , Zhixuan Zhang , Chao Yuan

{"title":"Multiphysics multilayer modelling and simulation of HTS REBCO magnets carrying direct currents under AC magnetic fields","authors":"Xuezhi Luo , Jun Ma , Huaqian Xiao , Zhixuan Zhang , Chao Yuan","doi":"10.1016/j.supcon.2025.100157","DOIUrl":"10.1016/j.supcon.2025.100157","url":null,"abstract":"<div><div>High temperature superconducting homopolar inductor machine (HTS-HIM) is concerned and studied for electric aircraft because of its high power density, high efficiency, and high power-to-weight ratio. In an HTS-HIM, the high temperature superconducting magnets carrying DC currents under alternating background magnetic fields work as excitation magnets. Under extreme electromagnetic conditions, the voltage, loss, and temperature of the HTS magnets will increase because of the dynamic resistance effect. To predict the behaviors of the HTS magnet, it is necessary to analyze its electromagnetic-thermal characteristics by using a multiphysics model. This paper establishes a 2D axisymmetric multilayer multiphysics HTS magnet model based on the <strong><em>H</em></strong>-formulation. By using this multilayer multiphysics model, the electromagnetic-thermal characteristics of each turn can be analyzed. Meanwhile, this model can not only analyze the total loss and loss components of each layer under various operating conditions but also predict the temperature and quench behaviors of each part. The result shows that the loss components of the REBCO layer have distinct temperature dependence. When considering the thermal field effect, the magnetization loss of the REBCO layer reduces by 75% and the transport loss of the REBCO layer increases by 45% under high direct currents and high AC magnetic fields. Meanwhile, the temperature of the external turn is higher than the internal turn, and the external turn is at risk of quench in the operating process when the direct currents and AC magnetic fields are high. The multilayer multiphysics model is a powerful tool for designing, analyzing, and optimizing the HTS magnets in HTS-HIMs, and this multiphysics modelling technique can be utilized in modelling and simulating HTS REBCO magnets in various applications.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"14 ","pages":"Article 100157"},"PeriodicalIF":5.6,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stress accommodation in nanoscale dolan bridges designed for superconducting qubits 超导量子比特纳米级dolan桥的应力调节

IF 5.6

Superconductivity Pub Date : 2025-03-18 DOI: 10.1016/j.supcon.2025.100158

S. Skinner-Ramos , M.L. Freeman , D. Pete , R.M. Lewis , M. Eichenfield , C. Thomas Harris

{"title":"Stress accommodation in nanoscale dolan bridges designed for superconducting qubits","authors":"S. Skinner-Ramos , M.L. Freeman , D. Pete , R.M. Lewis , M. Eichenfield , C. Thomas Harris","doi":"10.1016/j.supcon.2025.100158","DOIUrl":"10.1016/j.supcon.2025.100158","url":null,"abstract":"<div><div>Josephson junctions are the principal circuit element in numerous superconducting quantum information devices and can be readily integrated into large-scale electronics. However, device integration at the wafer scale necessarily depends on having a reliable, high-fidelity, and high-yield fabrication method for creating Josephson junctions. When creating Al/AlO<span><math><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span> based superconducting qubits, the standard Josephson junction fabrication method relies on a sub-micron suspended resist bridge, known as a Dolan bridge, which tends to be particularly fragile and can often times fracture during the resist development process, ultimately resulting in device failure. In this work, we demonstrate a unique Josephson junction lithography mask design that incorporates stress-relief channels. Our simulation results show that the addition of stress-relief channels reduces the lateral stress in the Dolan bridge by more than 70% for all the bridge geometries investigated. In practice, our novel mask design significantly increased the survivability of the bridge during device processing, resulting in 100% yield for over 100 Josephson junctions fabricated.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"14 ","pages":"Article 100158"},"PeriodicalIF":5.6,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143828769","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

An adaptive-extended modeling to accelerate electromagnetic study and data generation in superconducting magnet applications 一种自适应扩展模型，以加速超导磁体应用中的电磁研究和数据生成

IF 5.6

Superconductivity Pub Date : 2025-03-01 DOI: 10.1016/j.supcon.2025.100156

Mingyang Wang , Haolan Chen , Tiantian Cai , Fangliang Dong , Junjie Jiang , Jie Sheng , Zhuyong Li

{"title":"An adaptive-extended modeling to accelerate electromagnetic study and data generation in superconducting magnet applications","authors":"Mingyang Wang , Haolan Chen , Tiantian Cai , Fangliang Dong , Junjie Jiang , Jie Sheng , Zhuyong Li","doi":"10.1016/j.supcon.2025.100156","DOIUrl":"10.1016/j.supcon.2025.100156","url":null,"abstract":"<div><div>Superconducting magnets possess unique electromagnetic properties, making them applicable in fields such as nuclear magnetic resonance, maglev, and fusion. These applications generally involve diverse environments featuring AC or DC conditions, where superconducting properties are influenced by various factors. Specifically, the most concerning properties in high temperature superconducting (HTS) magnets include critical current, AC loss, screening current effects, and so on. Finite element method is widely used in reliable numerical studies for these properties. Several popular models have been proposed and developed to get higher precision and less calculation time. However, constrained by computational resources, they still have challenges in supporting high-throughput analysis. In various studies on electromagnetic characteristics of magnets, a substantial amount of data is often required to facilitate the introduction of artificial intelligence (AI) methods or optimization approaches. This paper proposes an adaptive-extended J-model to compute superconducting properties, further enhancing the efficiency of electromagnetic study and also serving to generate dataset for AI methods. It reduces computation time to only 20%–30% of that of the existing fastest model while maintaining similar levels of accuracy. By using this method as a data-generative tool, the dataset of a series of HTS solenoids including 2000 turns is expeditiously obtained and employed to predict the screening current induced field. The predictive performance is reliable under the dataset calculation time of mere minutes. This study significantly shortens the time to realize big dataset demands, accelerating electromagnetic study of superconducting magnets in various scenarios.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"13 ","pages":"Article 100156"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructural evolution mechanism of Ba0.6KαFe2As2 Cu/Ag composite sheathed superconducting tapes ba0.6 k - α fe2as2 Cu/Ag复合护套超导带微观组织演化机理

IF 5.6

Superconductivity Pub Date : 2025-03-01 DOI: 10.1016/j.supcon.2025.100154

Wenchao Li , Chen Guo , Meng Han , Minghui Tang , Chiheng Dong , Chao Yao , Dongliang Wang , Yanwei Ma

{"title":"Microstructural evolution mechanism of Ba0.6KαFe2As2 Cu/Ag composite sheathed superconducting tapes","authors":"Wenchao Li , Chen Guo , Meng Han , Minghui Tang , Chiheng Dong , Chao Yao , Dongliang Wang , Yanwei Ma","doi":"10.1016/j.supcon.2025.100154","DOIUrl":"10.1016/j.supcon.2025.100154","url":null,"abstract":"<div><div>Low-cost Cu/Ag composite sheathed Ba<span><math><msub><mrow></mrow><mrow><mi>0.6</mi></mrow></msub></math></span>K<span><math><msub><mrow></mrow><mrow><mi>α</mi></mrow></msub></math></span>Fe<sub>2</sub>As<sub>2</sub> superconducting tapes have been the focus of considerable research interest in terms of superconducting properties and performance improvement. The K-doping content has a great influence on the transport critical current density (<span><math><msub><mrow><mi>J</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>) of Cu/Ag composite sheathed tapes. This study analyzes the evolution occurring within the micro-composition and the mechanism affecting the transport <span><math><msub><mrow><mi>J</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> in Ba<span><math><msub><mrow></mrow><mrow><mi>0.6</mi></mrow></msub></math></span>K<span><math><msub><mrow></mrow><mrow><mi>α</mi></mrow></msub></math></span>Fe<sub>2</sub>As<sub>2</sub> (0.42 <span><math><mo>≤</mo></math></span>\u0000 <span><math><mi>α</mi></math></span>\u0000 <span><math><mo>≤</mo></math></span> 0.54) raw material, by modulating the ratio of K. It has been demonstrated that both extremes of K content, namely an insufficient or excessive amount, have an adverse effect on phase purity of the powders. Consequently, this has a direct impact on the transport <span><math><msub><mrow><mi>J</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> of tapes. Cu/Ag tapes fabricated using a precursor powder with an optimal K ratio <span><math><mrow><mi>α</mi><mo>∼</mo></mrow></math></span>0.464 exhibited the highest performance, with a <span><math><msub><mrow><mi>J</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> of 5.8 × 10<sup>4</sup> A cm <sup>−2</sup> at 10 T and 4.2 K. The optimized Cu/Ag composite tapes have been found to have superior advantages for high-field applications.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"13 ","pages":"Article 100154"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of distributed Bragg reflectors on the intrinsic detection efficiency of superconducting nanowire single-photon detectors 分布布拉格反射器对超导纳米线单光子探测器本征探测效率的影响

IF 5.6

Superconductivity Pub Date : 2025-03-01 DOI: 10.1016/j.supcon.2025.100152

Hongxin Xu , Hailong Han , You Xiao , Jiamin Xiong , Chaomeng Ding , Zhiyun Shu , Yuchi Li , Xiaoyu Liu , Lixing You , Zhen Wang , Hao Li

{"title":"Impact of distributed Bragg reflectors on the intrinsic detection efficiency of superconducting nanowire single-photon detectors","authors":"Hongxin Xu , Hailong Han , You Xiao , Jiamin Xiong , Chaomeng Ding , Zhiyun Shu , Yuchi Li , Xiaoyu Liu , Lixing You , Zhen Wang , Hao Li","doi":"10.1016/j.supcon.2025.100152","DOIUrl":"10.1016/j.supcon.2025.100152","url":null,"abstract":"<div><div>In this study, we investigate the impact of substrates with distributed Bragg reflectors (DBRs) on the proximity effect during the fabrication of superconducting nanowire single-photon detectors (SNSPDs) using electron beam lithography. We compare the linewidth compression and line edge roughness of nanowires prepared on three different DBRs substrates. Additionally, we characterize the variations in switching current (I<span><math><msub><mrow></mrow><mrow><mi>s</mi><mi>w</mi></mrow></msub></math></span>) and intrinsic detection efficiency (IDE) at a 2.2-K temperature. The results show that when the substrates are composed of low atomic number materials, such as Si and SiO<sub>2</sub>, the proximity effect is significantly mitigated. As a consequence, the lithography quality of nanowires is effectively improved, thus enhancing the IDE of SNSPDs. This study is expected to provide new insights into the fabrication of SNSPDs and lay the foundation for the preparation of high-performance and high-uniformity large-area devices.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"13 ","pages":"Article 100152"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The superconducting magnet development for the next generation ECR ion source on LEAF 下一代ECR离子源在LEAF上的超导磁体研制

IF 5.6

Superconductivity Pub Date : 2025-03-01 DOI: 10.1016/j.supcon.2025.100151

Liangting Sun , Wei Wu , Beimin Wu , Yuquan Chen , Li Zhu , Xianjin Ou , Shijun Zheng , Enmin Mei , Mingzhi Guan , Canjie Xin , Xudong Wang , W. Lu , L.X. Li , W.H. Zhang , B. Li , Wenhui Ren , Hongwei Zhao

{"title":"The superconducting magnet development for the next generation ECR ion source on LEAF","authors":"Liangting Sun , Wei Wu , Beimin Wu , Yuquan Chen , Li Zhu , Xianjin Ou , Shijun Zheng , Enmin Mei , Mingzhi Guan , Canjie Xin , Xudong Wang , W. Lu , L.X. Li , W.H. Zhang , B. Li , Wenhui Ren , Hongwei Zhao","doi":"10.1016/j.supcon.2025.100151","DOIUrl":"10.1016/j.supcon.2025.100151","url":null,"abstract":"<div><div>In December 2024, the world first stand-alone Low Energy high intensity heave ion Accelerator Facility (LEAF) has been commissioned to its design performance and passed the acceptance test conducted by the National Natural Science Foundation of China. LEAF is designed and built by the Institute of Modern Physics, CAS, which is aiming to provide unprecedent ion beam conditions for the researches of nuclear astrophysics, atomic physics, nuclear materials and so on. To realize this goal, it is essential to develop an ECR (Electron Cyclotron Resonance) ion source beyond the performance of the state-of-the-art machines. This ECR ion source is called FECR (First 4th generation ECR ion source) designed to be operated with the plasma heated by 45 GHz microwave frequency that needs high magnetic field confinement. Therefore, with FECR Nb<sub>3</sub>Sn superconducting technology was incorporated to ECR ion source for the first time in the world. FECR features Nb<sub>3</sub>Sn solenoids and NbTi sextupole coils that enables its high performing operation at 45 + 28 GHz microwave heating.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"13 ","pages":"Article 100151"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolution of superconductivity and corresponding electronic structure in pressurized Nb3Sn 加压Nb3Sn中超导性及其电子结构的演化

IF 5.6

Superconductivity Pub Date : 2025-03-01 DOI: 10.1016/j.supcon.2025.100153

Wenxuan Chen , Xintian Chen , Yangfan Gao , Yazhou Zhou , Shu Cai , Jinyu Zhao , Ke Yang , Aiguo Li , Sheng Jiang , Qi Wu , Defang Duan , Jing Guo , Liling Sun

{"title":"Evolution of superconductivity and corresponding electronic structure in pressurized Nb3Sn","authors":"Wenxuan Chen , Xintian Chen , Yangfan Gao , Yazhou Zhou , Shu Cai , Jinyu Zhao , Ke Yang , Aiguo Li , Sheng Jiang , Qi Wu , Defang Duan , Jing Guo , Liling Sun","doi":"10.1016/j.supcon.2025.100153","DOIUrl":"10.1016/j.supcon.2025.100153","url":null,"abstract":"<div><div>The studies on superconductors under extreme conditions offer valuable insights for assessing their potential in new applications. Nb<sub>3</sub>Sn, an intermetallic alloy with an A15 structure, is a key commercial superconductor known for its high critical current and magnetic field tolerance. Here, we systematically investigated the physical properties of Nb<sub>3</sub>Sn under high pressures. Our findings reveal that superconductivity in Nb<sub>3</sub>Sn remains robust up to <span><math><mo>∼</mo></math></span>142 GPa, demonstrating remarkable stability despite a gradual suppression of <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> with increasing pressure. First-principles calculations indicate that the pressure-dependent superconducting behavior is primarily driven by variations in the density of states of Nb’s d-electrons, particularly contributions from the <span><math><msub><mrow><mi>d</mi></mrow><mrow><msup><mrow><mi>x</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>−</mo><msup><mrow><mi>y</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></msub></math></span> and <span><math><msub><mrow><mi>d</mi></mrow><mrow><msup><mrow><mi>z</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></msub></math></span> orbitals. Furthermore, we predict the potential for synthesizing Nb<sub>3</sub>Sn films and demonstrate that biaxial strain induced by suitable substrates can preserve their superconducting properties. This comprehensive study not only enhances our understanding of Nb<sub>3</sub>Sn’s superconducting mechanism under high pressure but also opens new avenues for its application in advanced superconducting technologies.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"13 ","pages":"Article 100153"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical and electromagnetic characteristics of MgB2 wires & Cable-in-Conduit Conductors for fusion magnet application 熔合磁体用MgB2导线和导管内电缆导体的机械和电磁特性

IF 5.6

Superconductivity Pub Date : 2025-03-01 DOI: 10.1016/j.supcon.2025.100155

Peng Gao , Jiahao Wan , Yishan Chen , Hongjun Ma , Weijun Wang , Xintao Zhang , Chao Dai , Tianli Dai , Yu Min , Arend Nijhuis , Matt Rindfleisch , Mike Tomsic , Huan Jin , Huajun Liu , Liu Fang , Jinggang Qin , Chao Zhou

{"title":"Mechanical and electromagnetic characteristics of MgB2 wires & Cable-in-Conduit Conductors for fusion magnet application","authors":"Peng Gao , Jiahao Wan , Yishan Chen , Hongjun Ma , Weijun Wang , Xintao Zhang , Chao Dai , Tianli Dai , Yu Min , Arend Nijhuis , Matt Rindfleisch , Mike Tomsic , Huan Jin , Huajun Liu , Liu Fang , Jinggang Qin , Chao Zhou","doi":"10.1016/j.supcon.2025.100155","DOIUrl":"10.1016/j.supcon.2025.100155","url":null,"abstract":"<div><div>A study on a 4-stage sub-size MgB <sub>2</sub> Cable-in-Conduit Conductor (CICC), tested at the Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP), revealed a 20% degradation in critical current at 4.2 K compared to single-strand data. To address this issue, the mechanical properties of MgB <sub>2</sub> wires from Hyper Tech and WST were investigated, and two sub-size CICCs were manufactured using a “close-to-1-ratio” Twente design with smaller diameter wires. These cables demonstrated no significant degradation in critical current after cabling and compaction, nor after electromagnetic load cycling. The results indicate that the close-to-1-ratio cable design is optimal for brittle superconducting materials such as MgB <sub>2</sub>, Nb<sub>3</sub>Sn, and BSCCO, as it minimizes mechanical stress and preserves superconducting properties. This design shows significant potential for the application of MgB <sub>2</sub> in next-generation fusion reactors, particularly in Poloidal Field (PF) coils, Correction Coils (CC), and feeders.</div></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"13 ","pages":"Article 100155"},"PeriodicalIF":5.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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