Physica C-superconductivity and Its Applications最新文献

Something about the Mechanism of Induction Phenomena: The forgotten work of Berta de Haas-Lorentz on diamagnetism in superconductors 感应现象的机理：被遗忘的Berta de Haas-Lorentz关于超导体抗磁性的工作

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-06-21 DOI: 10.1016/j.physc.2025.1354762

Giulia Venditti , Carlo Beenakker , Louk Rademaker

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Quantum fisher information reveals UV-IR mixing in the strange metal 量子费雪信息揭示了这种奇怪金属中的紫外-红外混合

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-06-18 DOI: 10.1016/j.physc.2025.1354750

David Bałut , Xuefei Guo , Niels de Vries , Dipanjan Chaudhuri , Barry Bradlyn , Peter Abbamonte , Philip W. Phillips

{"title":"Quantum fisher information reveals UV-IR mixing in the strange metal","authors":"David Bałut , Xuefei Guo , Niels de Vries , Dipanjan Chaudhuri , Barry Bradlyn , Peter Abbamonte , Philip W. Phillips","doi":"10.1016/j.physc.2025.1354750","DOIUrl":"10.1016/j.physc.2025.1354750","url":null,"abstract":"<div><div>The density-density response in optimally doped Bi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Sr<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>CaCu<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<span><math><msub><mrow></mrow><mrow><mn>8</mn><mo>+</mo><mi>x</mi></mrow></msub></math></span> has recently been shown to exhibit conformal symmetry. Using, the experimentally inferred conformal dynamic susceptibility, we compute the resultant quantum Fisher information (QFI), a witness to multi-partite entanglement. For a Fermi liquid, we find that the QFI grows quadratically as the temperature increases, consistent then with the phase space available for scattering in the standard theory of metals. By contrast, the QFI in a strange metal increases as a power law at as the temperature decreases, but ultimately extrapolates to a constant at <span><math><mrow><mi>T</mi><mo>=</mo><mn>0</mn></mrow></math></span>. The constant is of the form, <span><math><msubsup><mrow><mi>ω</mi></mrow><mrow><mi>g</mi></mrow><mrow><mn>2</mn><mi>Δ</mi></mrow></msubsup></math></span>, where <span><math><mi>Δ</mi></math></span> is the conformal dimension and <span><math><msub><mrow><mi>ω</mi></mrow><mrow><mi>g</mi></mrow></msub></math></span> is the UV cutoff which is on the order of the pseudogap. As this constant depends on both UV and IR properties, it illustrates that multipartite entanglement in a strange metal exhibits UV-IR mixing, a benchmark feature of doped Mott insulators as exemplified by dynamical spectral weight transfer. We conclude with a discussion of the implication of our results for low-energy reductions of the Hubbard model.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354750"},"PeriodicalIF":1.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307895","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}

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Corrigendum to “Can dd excitations mediate pairing?” [Physica C: Superconductivity and its Applications 613 (2023) 1354321] “添加激励可以调节配对吗？”[物理学报：C辑：超导及其应用]

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-06-05 DOI: 10.1016/j.physc.2025.1354753

Francesco Barantani , Christophe Berthod , Dirk van der Marel

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Conductivity of strongly disordered ultra-thin MoC superconducting films investigated by transmission line spectroscopy 用传输线谱法研究强无序超薄MoC超导膜的电导率

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-06-05 DOI: 10.1016/j.physc.2025.1354749

Martin Baránek , Pavol Neilinger , Daniel Manca , Oleg G. Turutanov , Miroslav Grajcar

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How do supercurrents die down when a superconductor goes normal? 当超导体正常时，超电流是如何消失的？

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-06-03 DOI: 10.1016/j.physc.2025.1354747

J.E. Hirsch

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Enhancing Hastelloy tape surfaces flattening efficiency via autonomously designed SDP system derived Y2O3 coatings 通过自主设计的SDP系统衍生的Y2O3涂层，提高哈氏合金带表面平坦化效率

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-06-02 DOI: 10.1016/j.physc.2025.1354744

Mingyuan Zhao , Bowan Tao , Ruipeng Zhao , Xi Chen , Zhenzhe Li , Tian Xie , Qichen Wang , Silong Fang , Ziwen Jin , Yudong Xia

{"title":"Enhancing Hastelloy tape surfaces flattening efficiency via autonomously designed SDP system derived Y2O3 coatings","authors":"Mingyuan Zhao , Bowan Tao , Ruipeng Zhao , Xi Chen , Zhenzhe Li , Tian Xie , Qichen Wang , Silong Fang , Ziwen Jin , Yudong Xia","doi":"10.1016/j.physc.2025.1354744","DOIUrl":"10.1016/j.physc.2025.1354744","url":null,"abstract":"<div><div>The widespread application of second-generation high-temperature superconducting (2G HTS) tapes has elevated demand for surface smoothing of long-length Hastelloy tapes utilizing simple and low-cost strategies. Amorphous Y<sub>2</sub>O<sub>3</sub> has been used to flatten the long-length Hastelloy tape surfaces via solution deposition planarization (SDP). In this work, the autonomously designed SDP system is applied to flatten the Hastelloy surface while significantly increasing progress rate. As a result, lifting speed up to 75 m/h, while the root mean square (RMS) roughness on Hastelloy tape surfaces was reduced from 28.13 nm to 0.76 nm over 5 × 5 μm² areas. These are superior to those of the state-of-the-art SDP lifting speeds. Additionally, the surface flattening process was elaborated through power spectral density (PSD). The Hastelloy tape surfaces have been confirmed to form a well-biaxially textured MgO buffer layer. The autonomously designed SDP system shed light on an effective strategy for flattening long-length Hastelloy tape surfaces.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354744"},"PeriodicalIF":1.3,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144194698","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}

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Analysis of the suspension current of a magnetically levitated superconducting rotor structure 磁悬浮超导转子结构悬浮电流分析

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-06-02 DOI: 10.1016/j.physc.2025.1354730

Xian Yi , Chunyan Cui , Xinning Hu , Yuan Zhang , Xu Cui , Hao Li , Qiuliang Wang , Quansheng Sun

{"title":"Analysis of the suspension current of a magnetically levitated superconducting rotor structure","authors":"Xian Yi , Chunyan Cui , Xinning Hu , Yuan Zhang , Xu Cui , Hao Li , Qiuliang Wang , Quansheng Sun","doi":"10.1016/j.physc.2025.1354730","DOIUrl":"10.1016/j.physc.2025.1354730","url":null,"abstract":"<div><div>The high precision of the superconducting magnetic levitation device relies on the rotor's high-speed rotation and disturbance resistance. In actual work, the appropriate support current is conducive to realizing the high-speed driving of the superconductor rotor and improving its anti-disturbance ability. A comprehensive analysis of suspension current characteristics in superconducting magnetic levitation systems is therefore essential. This study analyzes the suspension current characteristics in superconducting magnetic levitation systems. The structure is first introduced, followed by a finite element model based on the vector magnetic potential equation to investigate electromagnetic relationships. A suspension current adjustment method is then proposed and validated through experimental tests. In conclusion, an analysis was conducted to determine the influence law of the change in suspension current on the drift speed. This analysis was based on the change in interference torque caused by the change in suspension current. The results establish a framework for optimizing suspension current adjustment and serve as a benchmark for improving device accuracy.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354730"},"PeriodicalIF":1.3,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144194697","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}

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Design and analysis of cold mass support system for superconducting magnets without transport protection 无传输保护超导磁体冷质量支撑系统的设计与分析

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-06-02 DOI: 10.1016/j.physc.2025.1354700

Zuda Fan , Ce Xu , Wei Zou , Hui Wang , Yichuan Zheng , Shunzhong Chen , Junsheng Cheng , Qiuliang Wang

{"title":"Design and analysis of cold mass support system for superconducting magnets without transport protection","authors":"Zuda Fan , Ce Xu , Wei Zou , Hui Wang , Yichuan Zheng , Shunzhong Chen , Junsheng Cheng , Qiuliang Wang","doi":"10.1016/j.physc.2025.1354700","DOIUrl":"10.1016/j.physc.2025.1354700","url":null,"abstract":"<div><div>For the superconducting magnets that require high environmental adaptability during unprotected long-distance transportation, the cold mass support structure must have sufficient rigidity to minimize the variation of coaxiality between the cold mass and the warm bore after transportation. Based on the T700 carbon fiber reinforced plastic (CFRP) with low thermal conductivity and high mechanical strength, a three-dimensional adjustable cold mass support structure is constructed. To monitor the tension forces of the rods and the displacement of the cold mass, the tension sensors and the displacement sensors are integrated into this structure. The support structure is analysed for conductive heat leak, structural strength and stability under vibration. The effects of highway transportation on the displacement of the cold mass and the stress of the rods are studied by vibration experiment. Additionally, the situation of the cold mass may still change under the long-term accumulation of transportation. An adjustment method of the displacement is proposed to solve this problem. The result shows that the displacement of the cold mass is less than 0.01 mm after the vibration experiment. The coaxiality error can be adjusted within 0.1 mm. The rods can support the stress during vibration. The design of the support structure is reasonable and reliable.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354700"},"PeriodicalIF":1.3,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144194760","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}

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Effect of chemical etching of copper stabilization layer on the performance and microstructure of REBa2Cu3O7-x coated conductors 化学蚀刻铜稳定层对REBa2Cu3O7-x涂层导体性能和微观结构的影响

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-06-02 DOI: 10.1016/j.physc.2025.1354715

Ziming Wang , Hao Liang , Zhenchuang Zhang , Xintao Zhang , Shuowei Gao , Han Yang , Zhan Zhang , Huan Jin , Chao Zhou , Jinggang Qin , Huajun Liu , Fang Liu

{"title":"Effect of chemical etching of copper stabilization layer on the performance and microstructure of REBa2Cu3O7-x coated conductors","authors":"Ziming Wang , Hao Liang , Zhenchuang Zhang , Xintao Zhang , Shuowei Gao , Han Yang , Zhan Zhang , Huan Jin , Chao Zhou , Jinggang Qin , Huajun Liu , Fang Liu","doi":"10.1016/j.physc.2025.1354715","DOIUrl":"10.1016/j.physc.2025.1354715","url":null,"abstract":"<div><div>The etching of metallic layers is a critical step in the preparation of superconducting joints and in the study of the degradation mechanism of the superconducting performance of REBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> (REBCO) coated conductors (CCs). The copper stabilization layer and the silver cap layer need to be completely removed from the specified area and retain excellent superconductivity and microstructure. Since REBCO CCs are sensitive to most inorganic solutions, the etching conditions can severely affect the performance and microstructure when using a wet etching process. We have systematically investigated the effects of ferric chloride (FeCl<sub>3</sub>) solutions on the crystal structure, microscopic morphology, critical current (<em>I</em><sub>c</sub>) and <em>n</em>-values of REBCO CCs when etching copper stabilization layers, and have obtained etching parameters that hardly degrade <em>I</em><sub>c</sub> of CCs. However, when the etching conditions were varied, we found a significant degradation of <em>I</em><sub>c</sub> and investigated the underlying causes of this degradation. Scanning electron microscopy (SEM), Raman spectroscopy and X-ray diffraction (XRD) analyses showed that the main cause of the superconducting performance degradation is the delamination of the superconducting layer and the increase of oxygen defects in the lattice.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354715"},"PeriodicalIF":1.3,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144194764","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}

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Numerical simulation and design of superconducting cusp magnet for 400 mm Magnetic-field-applied Czochralski (MCZ) single crystal silicon growth 400 mm磁场作用下chzochralski （MCZ）单晶硅生长超导尖磁体的数值模拟与设计

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-06-02 DOI: 10.1016/j.physc.2025.1354721

Bin Zhao , Jinxing Zheng , Ming Li , Tao Ma

{"title":"Numerical simulation and design of superconducting cusp magnet for 400 mm Magnetic-field-applied Czochralski (MCZ) single crystal silicon growth","authors":"Bin Zhao , Jinxing Zheng , Ming Li , Tao Ma","doi":"10.1016/j.physc.2025.1354721","DOIUrl":"10.1016/j.physc.2025.1354721","url":null,"abstract":"<div><div>Single crystal silicon is currently used for the production of chips and solar cells, commonly prepared using the Magnetic-field-applied Czochralski (MCZ) method. However, during the crystal growth process, the uneven heating distribution induces a strong thermal convection effect in the melt, which facilitates the doping of the crystal with oxygen impurities and affects the quality of the produced crystals. With the implementation of the cusp magnetic field method, the melt convection can be effectively suppressed. Two symmetrically placed superconducting coils generate a cusp magnetic field by passing currents in opposite directions. In this work, we selected a 42-inch crucible to prepare a single crystal silicon with a diameter of 400 mm. We systematically investigated the convective inhibition effect of the magnetic field by comparing the flow and temperature fields of the melt with and without the applied cusp magnetic field. To achieve a radial magnetic flux density (B<sub>r</sub>) greater than 1000 G at the crucible wall, the parameters of the two superconducting coils were optimized. Based on the optimization results, we fabricated a YBCO high temperature superconducting (HTS) magnet with a coil inner radius of 900 mm and a coil spacing of 350 mm. The cooling structure and the tests were presented, which required 22 days to lower the coil’s temperature to 10.6 K. Finally, B<sub>r</sub> at the crucible wall was measured, yielding a good consistency with the simulated values.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354721"},"PeriodicalIF":1.3,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144194765","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}

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