Physica C-superconductivity and Its Applications最新文献_第2页

Magneto-thermal stability analysis of Nb3Sn multifilament superconducting wires in rotating magnetic fields 旋转磁场中Nb3Sn多丝超导丝的磁热稳定性分析

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-07 DOI: 10.1016/j.physc.2025.1354684

An He , Yu Jia , Wei Liu

{"title":"Magneto-thermal stability analysis of Nb3Sn multifilament superconducting wires in rotating magnetic fields","authors":"An He , Yu Jia , Wei Liu","doi":"10.1016/j.physc.2025.1354684","DOIUrl":"10.1016/j.physc.2025.1354684","url":null,"abstract":"<div><div>Superconducting wires in superconducting motors typically operate in environments with strong magnetic fields and high currents, which may trigger flux jumps accompanied by rapid temperature rises. This can lead to a decrease in the wire’s current-carrying capacity and even result in a quench. In this study, the Nb<sub>3</sub>Sn superconducting wire, consisting of multiple superconducting filaments and copper, was modeled by constraining the net current of each filament to be zero in order to simulate the three-dimensional twisting characteristics. The magneto-thermal stability of the superconducting wire under rotating magnetic fields was investigated. The effects of the magnetic field amplitude and frequency on the flux jump behavior of the Nb<sub>3</sub>Sn superconducting wire were analyzed. As the magnetic field amplitude increased, the frequency range of flux jumps initially increased and then decreased. We examine the effect of different ratios of rotational to alternating fields <span><math><mi>k</mi></math></span> on flux jumps. At lower frequencies, the number of flux jumps increased with <span><math><mi>k</mi></math></span>, at higher frequencies, the number of flux jumps initially increased and then decreased. Subsequently, the effects of the Cu/SC ratio and the number of filaments on flux jumps were studied. For a fixed frequency, the number of flux jumps and the temperature rise exhibited non-monotonic variations with the magnetic field amplitude. When the magnetic field amplitude fixed, both the number of flux jumps and the temperature rise decreased with increasing frequency. Finally, the variation in the number of flux jumps with the Cu/SC ratio and <span><math><mi>k</mi></math></span> was discussed.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"632 ","pages":"Article 1354684"},"PeriodicalIF":1.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791663","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}

引用次数: 0

Electromagnetic design and performance analysis of a 20 MW-class high temperature superconducting induction/synchronous motor for electric aircraft applications using a self-assembling design method 应用自组装设计方法对电动飞机用20mw级高温超导感应/同步电机进行电磁设计与性能分析

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-07 DOI: 10.1016/j.physc.2025.1354690

Masayoshi Yamamoto, Taketsune Nakamura

引用次数: 0

Motion characteristics of a self-driven HTS bulk maglev under the composite magnetic field 复合磁场下自驱动高温超导体磁浮的运动特性

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-07 DOI: 10.1016/j.physc.2025.1354686

Yonghai Zhao , Jun Zheng , Xuanbo Wang

{"title":"Motion characteristics of a self-driven HTS bulk maglev under the composite magnetic field","authors":"Yonghai Zhao , Jun Zheng , Xuanbo Wang","doi":"10.1016/j.physc.2025.1354686","DOIUrl":"10.1016/j.physc.2025.1354686","url":null,"abstract":"<div><div>High temperature superconducting (HTS) maglev has the advantages of levitation-guidance integration and low magnetic resistance due to pinning effects. Currently, most HTS maglev systems adopt linear motors for propulsion, requiring the installation of the mover on the maglev vehicle and the stator on the track separately. It is potential to establish the composite pancake coil magnetic field based on permanent magnet guideway (PMG), which can bring HTS bulks the original levitation and guidance force generated and driving force. Based on the self-development micro levitation force test device, the paper explores the feasibility of using coils to drive HTS bulks. At a working height (WH) of 12 mm and a coil current of 15 A, the maximum driving force can reach 0.2 N. The driving force can be increased by reducing the WH or increasing the field cooling height (FCH). Based on the COMSOL Multiphysics software, the three-dimensional finite element simulation model of HTS bulks combined with the motion equation was established. Qualitative analysis of the free movement characteristics of the HTS bulk driven by the coils was performed, and the differences between different current directions were compared. In addition, the paper built a driving principal model to analyze the movement characteristics of HTS bulks driven by coils. Consistent with the simulation results, the levitation height increases, and positive pitch angle occurs when driven by the positive current, while the levitation height decreases, and negative pitch angle occurs when driven by the negative current.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"632 ","pages":"Article 1354686"},"PeriodicalIF":1.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791758","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}

引用次数: 0

Enhanced stability and optimization of SMES-based deregulated power systems using the repulsive firefly algorithm 利用排斥性萤火虫算法增强基于中小企业的解除管制电力系统的稳定性和优化

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-07 DOI: 10.1016/j.physc.2025.1354692

Asit Mohanty , Sthitapragyan Mohanty , Pragyan P Mohanty , Manzoore Elahi M. Soudagar , S. Ramesh , Javed Khan Bhutto , Abdulwasa Bakr Barnawi , Erdem Cuce

{"title":"Enhanced stability and optimization of SMES-based deregulated power systems using the repulsive firefly algorithm","authors":"Asit Mohanty , Sthitapragyan Mohanty , Pragyan P Mohanty , Manzoore Elahi M. Soudagar , S. Ramesh , Javed Khan Bhutto , Abdulwasa Bakr Barnawi , Erdem Cuce","doi":"10.1016/j.physc.2025.1354692","DOIUrl":"10.1016/j.physc.2025.1354692","url":null,"abstract":"<div><div>The growing incorporation of renewable energy into deregulated power systems requires advanced hardware solutions, such as Superconducting Magnetic Energy Storage (SMES), as well as more complex control algorithms that surpass traditional Automatic Governor Control (AGC) methods based on PID or IPC techniques.</div><div>This paper introduces an innovative method utilizing the Repulsive Firefly Algorithm (RFA) for the dynamic management and optimization of a two-agent deregulated power system. The RFA, augmented with a repulsion mechanism, markedly enhances exploratory capabilities and reduces premature convergence, hence providing strong performance in extremely dynamic and uncertain grid settings. The proposed RFA-based method efficiently mitigates frequency fluctuations and optimizes power distribution across independent market entities by dynamically adjusting the control settings of the SMES and other system components. The fast response and exceptional efficiency of SMES are vital for stabilizing the power grid during fluctuations caused by renewable energy sources. Simulation results indicate that RFA surpasses traditional methods, providing enhanced control accuracy, diminished frequency fluctuations, and increased power flow stability. This study highlights the capability of RFA as a sophisticated optimization instrument for improving the resilience and efficiency of contemporary deregulated power systems that incorporate renewable energy sources.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"632 ","pages":"Article 1354692"},"PeriodicalIF":1.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791772","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}

引用次数: 0

Bending characteristics of multi-layer spiral HTS cable with large tape gap 大带隙多层螺旋高温超导电缆弯曲特性研究

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-07 DOI: 10.1016/j.physc.2025.1354691

Haosheng Ye, Xuan Zhou, Jie Sheng, Jinshan Yang, Zhijian Jin, Yue Zhao

{"title":"Bending characteristics of multi-layer spiral HTS cable with large tape gap","authors":"Haosheng Ye, Xuan Zhou, Jie Sheng, Jinshan Yang, Zhijian Jin, Yue Zhao","doi":"10.1016/j.physc.2025.1354691","DOIUrl":"10.1016/j.physc.2025.1354691","url":null,"abstract":"<div><div>Assembling high-temperature superconducting (HTS) tapes into robust cable with spiral geometry is widely adopted to achieve high current-carrying capacity and strong mechanical properties in high-field magnet applications. However, multi-layer structure of spiral HTS cable undermines its bending performance due to complex factors, which have not been comprehensively clarified yet. In this paper, the influence of the tape gap on the bending characteristics of double-layer spiral HTS cable has been investigated through both experimental and numerical methods. and we revealed a distinct mechanism of critical current degradation during bending correlated with large tape gap. Result shows that, the large tape gap, as an unneglectable geometrical irregularity, leads to the increment of the interlayer friction coefficient. Moreover, with the increase of tape gap, additional compressive strain would be imposed on tape, leading to the exacerbation of imbalance of strain distribution. Therefore, cable samples with larger tape gap exhibit inferior bending performance compared to those with smaller tape gap, and this earlier occurrence of critical current degradation during bending process is primarily manifested in the outer layer. Conclusion obtained from this paper is anticipated to assist the understanding of the mechanism of bending performance degradation, as well as the improvement of engineering production for multi-layer spiral HTS cable.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"632 ","pages":"Article 1354691"},"PeriodicalIF":1.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791771","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}

引用次数: 0

Enhanced superconductivity in non-centrosymmetric hexagonal HfRuAs 非中心对称六方HfRuAs的超导性增强

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-04-02 DOI: 10.1016/j.physc.2025.1354710

Lijia Zhou , Xin Chen , Guangtong Shan , Qiang Li , Xiaojun Kuang , Xianran Xing

{"title":"Enhanced superconductivity in non-centrosymmetric hexagonal HfRuAs","authors":"Lijia Zhou , Xin Chen , Guangtong Shan , Qiang Li , Xiaojun Kuang , Xianran Xing","doi":"10.1016/j.physc.2025.1354710","DOIUrl":"10.1016/j.physc.2025.1354710","url":null,"abstract":"<div><div>We report the synthesis, crystal structure, superconductivity, and physical properties of HfRuAs, a ternary equiatomic compound that can crystallize in either the TiFeSi-type orthorhombic (o’-phase) or the Fe<sub>2</sub>P-type hexagonal (h-phase) structure. Our synthesized polycrystalline samples exhibit coexistence of both two phases due to synthesis conditions. The h-phase demonstrates bulk type-II weak-coupling superconductivity with a superconducting transition temperature of approximately 7.25 K, and an upper critical field of 12.40 T. Structural refinements suggest that the expansion of Ru-Ru distances within triangular clusters may be associated with the enhancement of superconductivity in the h-phase. First-principles calculations confirm that antisymmetric spin-orbit coupling (ASOC) induces significant band splitting and opens a fully gapped superconducting state. These results indicate that h-phase HfRuAs is a promising candidate for exploring superconductivity in weakly correlated, non-centrosymmetric superconductors.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354710"},"PeriodicalIF":1.3,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791021","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}

引用次数: 0

Holographic Schwinger–Keldysh effective field theories including a non-hydrodynamic mode 包括非水动力模式的全息Schwinger-Keldysh有效场理论

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-03-29 DOI: 10.1016/j.physc.2025.1354701

Yan Liu , Ya-Wen Sun , Xin-Meng Wu

引用次数: 0

Universality and crossovers for quantum-criticality in 2d metals 二维金属量子临界的普遍性和交叉性

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-03-26 DOI: 10.1016/j.physc.2025.1354703

Chandra M. Varma

{"title":"Universality and crossovers for quantum-criticality in 2d metals","authors":"Chandra M. Varma","doi":"10.1016/j.physc.2025.1354703","DOIUrl":"10.1016/j.physc.2025.1354703","url":null,"abstract":"<div><div>A simple generalization of the theory of crossovers in classical-criticality to quantum-criticality gives that, a Heisenberg model with a small anisotropy favoring planar order has a cross-over towards the fixed point of the xy model in the temperature direction which is very rapid compared to those in the orthogonal directions, if the temporal correlation length is much larger than the spatial correlation length, i.e. for a large dynamic exponent <span><math><mi>z</mi></math></span>. At the other end of the flow, the stability of the fixed point of the quantum xy model coupled to fermions is exponentially enhanced in the temperature direction. This is used to explain why the quantum-critical fluctuations of all measured 2d anti-ferromagnetic compounds — cuprates, heavy-fermion and Fe-based metals shows the characteristic fluctuations of the quantum xy model, and have the same anomalous transport and thermodynamic properties as the cuprates and twisted WSe<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> and Graphene. We segue briefly to the range of extended quantum-criticality due to disorder by generalizing the Harris criteria as well, using the properties of the quantum xy model. The observed <span><math><mrow><mi>T</mi><mo>ln</mo><mi>T</mi></mrow></math></span> specific heat at criticality is derived quite simply using the same methods which derive the cross-overs.</div><div>This paper is written for the commemoration volume for Jan Zaanen whom I knew very well, starting from his days as a post-doc at Bell labs to his career as a distinguished Professor at Leiden. Despite a complete difference in the approach towards the problems of our common interest later, we remained very good friends.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354703"},"PeriodicalIF":1.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777515","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}

引用次数: 0

Origin of the reentrant tetragonal phase in hole-doped Fe-pnictide superconductors: Role of intersite Coulomb interaction 空穴掺杂铁镍超导体中可重入四方相的起源：场间库仑相互作用的作用

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-03-22 DOI: 10.1016/j.physc.2025.1354699

Hao Luo, Huan Li, Xing Ming, Xiao-Jun Zheng

{"title":"Origin of the reentrant tetragonal phase in hole-doped Fe-pnictide superconductors: Role of intersite Coulomb interaction","authors":"Hao Luo, Huan Li, Xing Ming, Xiao-Jun Zheng","doi":"10.1016/j.physc.2025.1354699","DOIUrl":"10.1016/j.physc.2025.1354699","url":null,"abstract":"<div><div>Using mean-field approaches within the extended five-orbital Hubbard model, we reveal that intersite Coulomb interactions play a crucial role in determining the distinct magnetic phases of iron-based superconductors. We demonstrate that the reentrant tetragonal (<span><math><msub><mrow><mi>C</mi></mrow><mrow><mn>4</mn></mrow></msub></math></span>) phase, which is a spin charge density wave (SCDW) phase, is a combination of the stripe-like antiferromagnetic phase (str-AFM) and the charge density wave (CDW) phase. We prove that SCDW is the ground state in the hole-doped Fe-pnictides as long as the intersite Coulomb interaction (<span><math><mi>V</mi></math></span>) increases with doping concentration. Our work not only provides a numerical realization of the reentrant <span><math><msub><mrow><mi>C</mi></mrow><mrow><mn>4</mn></mrow></msub></math></span> state but also emphasizes the significant role of intersite interactions in the emergence of this phase, offering a deep understanding into the complex diagram phase of iron-based materials.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"632 ","pages":"Article 1354699"},"PeriodicalIF":1.3,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143681880","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}

引用次数: 0

Superconducting correlations in the asymmetric Hubbard model 非对称哈伯德模型中的超导相关性

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-03-18 DOI: 10.1016/j.physc.2025.1354693

Pavol Farkašovský

{"title":"Superconducting correlations in the asymmetric Hubbard model","authors":"Pavol Farkašovský","doi":"10.1016/j.physc.2025.1354693","DOIUrl":"10.1016/j.physc.2025.1354693","url":null,"abstract":"<div><div>The projector Quantum-Monte-Carlo method is used to examine effects of down-spin electron hopping <span><math><msub><mrow><mi>t</mi></mrow><mrow><mi>↓</mi></mrow></msub></math></span> and the on-site interaction <span><math><mi>U</mi></math></span> between the up and down spin electrons on superconducting correlations in the two-dimensional asymmetric Hubbard model. It is shown that both, the down-spin electron hopping, as well as the on-site interaction strongly enhance the superconducting correlations in the <span><math><mi>d</mi></math></span>-wave channel. The most significant enhancement of superconducting correlations, by down-spin electron hopping, is found for electron concentrations near the half-filled band case where, in addition, the strong connection between the diagonal charge stripes and the superconducting correlations is observed and the increasing on-site interaction <span><math><mi>U</mi></math></span> further enhances this effect. The enhancement of superconducting correlations is observed also in the axial striped phase, while it is negligible in the segregated phase. This opens new route to understanding the relation between the inhomogeneous charge ordering and superconductivity in strongly correlated electron systems.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"632 ","pages":"Article 1354693"},"PeriodicalIF":1.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644296","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}

引用次数: 0