Physica C-superconductivity and Its Applications最新文献

{"title":"Corrigendum to “Can dd excitations mediate pairing?” [Physica C: Superconductivity and its Applications 613 (2023) 1354321]","authors":"Francesco Barantani , Christophe Berthod , Dirk van der Marel","doi":"10.1016/j.physc.2025.1354753","DOIUrl":"10.1016/j.physc.2025.1354753","url":null,"abstract":"","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354753"},"PeriodicalIF":1.3,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144212475","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":"How do supercurrents die down when a superconductor goes normal?","authors":"J.E. Hirsch","doi":"10.1016/j.physc.2025.1354747","DOIUrl":"10.1016/j.physc.2025.1354747","url":null,"abstract":"<div><div>The supercurrent flowing near the surface of a type I superconducting body in the presence of an external magnetic field carries kinetic energy and angular momentum. When the macroscopic body transits into the normal state and magnetic field lines start penetrating it, Faraday’s law induces electric currents opposing the change in magnetic flux, that in the aggregate carry kinetic energy and angular momentum many orders of magnitude larger than the supercurrent in the initial state. These currents die down, and their angular momentum is transferred to the body as a whole, without generation of entropy. The conventional theory of superconductivity does not explain how this happens. The alternative theory of hole superconductivity does: it requires carriers with negative effective mass. Our theory also provides an explanation for why flux is generically trapped in type I superconductors under field cooling conditions.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354747"},"PeriodicalIF":1.3,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203418","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":"Enhancing Hastelloy tape surfaces flattening efficiency via autonomously designed SDP system derived Y2O3 coatings","authors":"Mingyuan Zhao ,&nbsp;Bowan Tao ,&nbsp;Ruipeng Zhao ,&nbsp;Xi Chen ,&nbsp;Zhenzhe Li ,&nbsp;Tian Xie ,&nbsp;Qichen Wang ,&nbsp;Silong Fang ,&nbsp;Ziwen Jin ,&nbsp;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 Y₂O₃ 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}

{"title":"Analysis of the suspension current of a magnetically levitated superconducting rotor structure","authors":"Xian Yi ,&nbsp;Chunyan Cui ,&nbsp;Xinning Hu ,&nbsp;Yuan Zhang ,&nbsp;Xu Cui ,&nbsp;Hao Li ,&nbsp;Qiuliang Wang ,&nbsp;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}

{"title":"Design and analysis of cold mass support system for superconducting magnets without transport protection","authors":"Zuda Fan ,&nbsp;Ce Xu ,&nbsp;Wei Zou ,&nbsp;Hui Wang ,&nbsp;Yichuan Zheng ,&nbsp;Shunzhong Chen ,&nbsp;Junsheng Cheng ,&nbsp;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}

{"title":"Effect of chemical etching of copper stabilization layer on the performance and microstructure of REBa2Cu3O7-x coated conductors","authors":"Ziming Wang ,&nbsp;Hao Liang ,&nbsp;Zhenchuang Zhang ,&nbsp;Xintao Zhang ,&nbsp;Shuowei Gao ,&nbsp;Han Yang ,&nbsp;Zhan Zhang ,&nbsp;Huan Jin ,&nbsp;Chao Zhou ,&nbsp;Jinggang Qin ,&nbsp;Huajun Liu ,&nbsp;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 REBa₂Cu₃O_7-x (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 (FeCl₃) solutions on the crystal structure, microscopic morphology, critical current (<em>I</em>_c) and <em>n</em>-values of REBCO CCs when etching copper stabilization layers, and have obtained etching parameters that hardly degrade <em>I</em>_c of CCs. However, when the etching conditions were varied, we found a significant degradation of <em>I</em>_c 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}

{"title":"Numerical simulation and design of superconducting cusp magnet for 400 mm Magnetic-field-applied Czochralski (MCZ) single crystal silicon growth","authors":"Bin Zhao ,&nbsp;Jinxing Zheng ,&nbsp;Ming Li ,&nbsp;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_r) 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_r 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}

{"title":"Novel CSC-SMES based modular unified power quality controller","authors":"Wenyong Guo ,&nbsp;Yun Hong ,&nbsp;Zhenning He ,&nbsp;Jianyu Lan ,&nbsp;Yahong Yang ,&nbsp;Wenju Sang ,&nbsp;Zhian Jia ,&nbsp;Renqiang Zhao","doi":"10.1016/j.physc.2025.1354745","DOIUrl":"10.1016/j.physc.2025.1354745","url":null,"abstract":"<div><div>This paper introduces a novel modular unified power quality controller (UPQC) topology based on superconducting magnetic energy storage (SMES) with coupled superconducting coil (CSC). Using coupled superconducting coils made of both <span><math><msub><mrow><mi>MgB</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> and YBCO types, the proposed UPQC maximizes the utilization rate of the superconductor to store magnetic energy for power quality enhancement. The novel topology addresses key power quality issues, such as voltage fluctuations, dynamic voltage sags, and harmonic distortions, by integrating advanced topology and control strategies. The simulation results show that the suppression ratios of voltage, current harmonic, and three phase current imbalance with the proposed UQPC are 68%, 73% and 98. 7%, respectively, offering significant advances to improve grid power quality.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354745"},"PeriodicalIF":1.3,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144194699","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":"Spin-triplet f-wave pairing via cyclic exchange in the anisotropic triangular Hubbard model: A route to unconventional superconductivity","authors":"S. Nishimoto ,&nbsp;Y. Ohta","doi":"10.1016/j.physc.2025.1354742","DOIUrl":"10.1016/j.physc.2025.1354742","url":null,"abstract":"<div><div>We investigate the interplay between ferromagnetism and unconventional superconductivity in a two-dimensional anisotropic triangular-lattice Hubbard model using the density-matrix renormalization group (DMRG) method. A novel mechanism for spin-triplet <em>f</em>-wave superconductivity is identified, driven by three-site cyclic-exchange interactions. This mechanism highlights the crucial role of lattice anisotropy and triangular hopping networks in stabilizing ferromagnetic correlations necessary for spin-triplet pairing. The slow decay of pair-correlation functions and their sign change under a <span><math><mrow><mi>π</mi><mo>/</mo><mn>3</mn></mrow></math></span> rotation confirm the dominant <em>f</em>-wave symmetry of the superconducting state. These findings offer a unified theoretical framework for understanding unconventional superconductivity in strongly correlated electron systems, with potential relevance to materials such as Bechgaard salts <span><math><mrow><msub><mrow><mrow><mo>(</mo><mtext>TMTSF</mtext><mo>)</mo></mrow></mrow><mrow><mn>2</mn></mrow></msub><mtext>X</mtext></mrow></math></span>, cobalt oxide <span><math><mrow><msub><mrow><mtext>Na</mtext></mrow><mrow><mn>0</mn><mo>.</mo><mn>35</mn></mrow></msub><msub><mrow><mtext>CoO</mtext></mrow><mrow><mn>2</mn></mrow></msub><mi>⋅</mi><mn>1</mn><mo>.</mo><mn>3</mn><msub><mrow><mtext>H</mtext></mrow><mrow><mn>2</mn></mrow></msub><mtext>O</mtext></mrow></math></span>, and layered perovskite <span><math><mrow><msub><mrow><mtext>Sr</mtext></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mtext>RuO</mtext></mrow><mrow><mn>4</mn></mrow></msub></mrow></math></span>.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354742"},"PeriodicalIF":1.3,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170425","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":"Pressure dependence of the superconducting properties of the rare-earth-based Heusler compounds ReRh2Sn (Re=Sc, Y and Lu)","authors":"A. Azouaoui ,&nbsp;S. Mouchou ,&nbsp;Y. Toual ,&nbsp;A. Rezzouk ,&nbsp;K. Bouslykhane ,&nbsp;N. Benzakour ,&nbsp;A. Hourmatallah","doi":"10.1016/j.physc.2025.1354736","DOIUrl":"10.1016/j.physc.2025.1354736","url":null,"abstract":"<div><div>This study employed density functional theory (DFT) within the generalized gradient approximation (GGA) to investigate the structural, electronic, vibrational and superconductivity properties of full-Heusler compounds ReRh₂Sn (Re=Sc, Y and Lu) under pressure ranging from 0 to 10 GPa. The analysis of the results reveals that the studied compounds exhibit metallic behavior with robust dynamic stability under pressures up to 10 GPa. The superconducting properties were evaluated using the isotropic Eliashberg function, and the obtained values of the superconducting critical temperature T<span><math><msub><mrow></mrow><mrow><mtext>C</mtext></mrow></msub></math></span> and electron–phonon coupling constant <span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>e</mi><mi>p</mi></mrow></msub></math></span> indicate that ReRh₂Sn compounds are weak to moderate coupled superconductors. Among the studied compounds, YRh₂Sn exhibits the highest superconducting critical temperature T<span><math><msub><mrow></mrow><mrow><mtext>C</mtext></mrow></msub></math></span>. As the pressure increases from 0 to 10 GPa, the electron–phonon coupling constant (<span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>e</mi><mi>p</mi></mrow></msub></math></span>) decreases. This reduction, along with a decrease in the density of states at the Fermi level, leads to a decline in the superconducting critical temperature. Additionally, we report the thermodynamic parameters such as the superconducting gap <span><math><mi>Δ</mi></math></span>, the Sommerfeld constant (<span><math><mi>γ</mi></math></span>), the specific heat jump at T<span><math><msub><mrow></mrow><mrow><mtext>C</mtext></mrow></msub></math></span> and the Ginzburg–Landau parameter(<span><math><msub><mrow><mi>κ</mi></mrow><mrow><mi>G</mi><mi>L</mi></mrow></msub></math></span>). The results demonstrate that these parameters decrease with increasing pressure for ScRh₂Sn and YRh₂Sn. However, between 0 to 5 GPa, the parameters decrease, while they decrease between 5 GPa to 10 GPa.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354736"},"PeriodicalIF":1.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107687","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}