Physica C-superconductivity and Its Applications最新文献_第3页

Optimization of high-efficiency and compact insulation structures for high-temperature superconducting cables

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-02-20 DOI: 10.1016/j.physc.2025.1354653

Ting Jiao , Honglei Li , Jingwei Yu , Yijia Huang

引用次数: 0

Design and implementation of dummy fill for chemical-mechanical polishing in superconducting single flux quantum circuit fabrication process

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-02-04 DOI: 10.1016/j.physc.2025.1354668

Mingfan Chen , Liliang Ying , Lijuan Li , Xue Zhang , Yu Wu , Weifeng Shi , Hui Xie , Linxian Ma , Jie Ren

{"title":"Design and implementation of dummy fill for chemical-mechanical polishing in superconducting single flux quantum circuit fabrication process","authors":"Mingfan Chen , Liliang Ying , Lijuan Li , Xue Zhang , Yu Wu , Weifeng Shi , Hui Xie , Linxian Ma , Jie Ren","doi":"10.1016/j.physc.2025.1354668","DOIUrl":"10.1016/j.physc.2025.1354668","url":null,"abstract":"<div><div>We present the development of a planarized fabrication process for large-scale Single Flux Quantum (RSFQ) circuits, termed “SIMIT Nb03b.” This process utilizes chemical-mechanical polishing (CMP) to planarize the SiO<sub>2</sub> interlayer dielectric, enabling reduced feature sizes and improved scalability. Dummy fill has proven to be an effective technique for reducing process variation and to improve planarization for chemical mechanical polishing, however, few studies have been reported on how to determine the appropriate fill pattern for superconducting integrated process. In this work, dummy fill structures were strategically placed outside the circuit region to minimize their impact on the circuit's logical functionality. Then we determine the pattern density of dummy fill based on the standard cell library of the process and a fill pattern density of 45 %, length of 7 μm, and spacing of 3.5 μm between each other is chosen. Experimental results show that, at this dummy fill setup, the non-uniformity of the SiO<sub>2</sub> film thickness after CMP is <5 %. We also developed an indirect method for assessing the residual SiO<sub>2</sub> thickness in circuit regions after CMP, which overcomes the limitations of direct measurement on small, narrow circuit patterns. This method enhanced the accuracy of measuring the residual SiO<sub>2</sub> film thickness in circuit regions by over 50 % compared to direct measurement techniques. The SIMIT Nb03b process has achieved a critical current of 6 kA/cm² and supported junction sizes down to 0.4 μm, small-scale superconducting integrated circuits fabricated by this process demonstrated a sufficiently wide operating margin, validating the efficacy of the developed fabrication technology.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"630 ","pages":"Article 1354668"},"PeriodicalIF":1.3,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350398","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

Analysis of “Revaluation of the lower critical field in superconducting H3S and LaH10 (Nature Comm. 13, 3194, 2022)” by V. S. Minkov et al

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-01-28 DOI: 10.1016/j.physc.2025.1354666

J.E. Hirsch , M. van Kampen

{"title":"Analysis of “Revaluation of the lower critical field in superconducting H3S and LaH10 (Nature Comm. 13, 3194, 2022)” by V. S. Minkov et al","authors":"J.E. Hirsch , M. van Kampen","doi":"10.1016/j.physc.2025.1354666","DOIUrl":"10.1016/j.physc.2025.1354666","url":null,"abstract":"<div><div>In <span><span>Nat Comm. 13, 3194, 2022</span><svg><path></path></svg></span> <span><span>[1]</span></span> and an “<span><span>Author Correction</span><svg><path></path></svg></span>” to it <span><span>[2]</span></span>, Minkov et al. presented magnetization data versus applied magnetic field for <span><math><mrow><msub><mrow><mi>H</mi></mrow><mrow><mn>3</mn></mrow></msub><mi>S</mi></mrow></math></span> and <span><math><mrow><mi>L</mi><mi>a</mi><msub><mrow><mi>H</mi></mrow><mrow><mn>10</mn></mrow></msub></mrow></math></span> under pressure, argued that the data provide evidence that these materials are superconducting at high temperatures, and extracted from the reported data the behavior of lower critical fields versus temperature. In several papers <span><span>[3]</span></span>, <span><span>[4]</span></span>, <span><span>[5]</span></span>, <span><span>[6]</span></span> analyzing Refs. <span><span>[1]</span></span>, <span><span>[2]</span></span> it was shown that the published magnetization data could not have been obtained from the reported measured data through the processes described in Refs. <span><span>[1]</span></span>, <span><span>[2]</span></span>. Recently, Minkov et al performed a revaluation of their experimental results <span><span>[7]</span></span> and argued that the results derived from their new analysis are consistent with the results reported earlier <span><span>[1]</span></span>. In addition, they made public the underlying data <span><span>[8]</span></span> from which the data published in Ref. <span><span>[1]</span></span> were derived. In this paper we analyze those underlying data and conclude that (a) the data published in Ref. <span><span>[1]</span></span> are incompatible with the underlying measured data, and (b) the revaluation analysis presented in Ref. <span><span>[7]</span></span> does not support the conclusions drawn by the authors in Ref. <span><span>[7]</span></span> nor Ref. <span><span>[1]</span></span>.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"630 ","pages":"Article 1354666"},"PeriodicalIF":1.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electron–phonon coupling in Mott insulators

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-01-23 DOI: 10.1016/j.physc.2025.1354657

Naoto Nagaosa

引用次数: 0

Design and analysis of a novel high TC-superconducting coupling for high torque transmission and speed regulation: A Comparative study with slotted eddy current coupling

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-01-21 DOI: 10.1016/j.physc.2024.1354642

Boris Joel Kenne Telezing, Jinxing Liu

{"title":"Design and analysis of a novel high TC-superconducting coupling for high torque transmission and speed regulation: A Comparative study with slotted eddy current coupling","authors":"Boris Joel Kenne Telezing, Jinxing Liu","doi":"10.1016/j.physc.2024.1354642","DOIUrl":"10.1016/j.physc.2024.1354642","url":null,"abstract":"<div><div>The purpose of this study is to provide a comprehensive description of the design and analysis of a novel hybrid superconducting coupling with axial-flux. The coupling is meant to improve output torque and function efficiently at both low and high speeds. Through the use of the magnetic circuit equivalent model, the torque characteristics of the coupling are analyzed, and the stability of the coupling is investigated at both low and high speeds. In this paper, a novel MEC model is established for the purpose of computing torque and magnetic field properties. Additionally, the paper demonstrates that the coupling has the potential to regulate speed in four different ways. The Novel High Critical Temperature Superconducting Magnetic Coupling (NHSC) has been shown to provide more torque than the Slotted Eddy Current Coupling (SEC), according to a study that was undertaken to compare the two. The gap between the two couplings grows as the thickness of the air gap increases. Through this research, the transmission capabilities of the NHSC have been demonstrated, and its effectiveness in speed regulation has been validated. A wide variety of applications can benefit from the production of high-performance superconducting couplings, which can be improved thanks to the useful insights provided by this research.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"629 ","pages":"Article 1354642"},"PeriodicalIF":1.3,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182559","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

The possible dominant factors in the mechanical properties of the metallic substrates of various commercial REBCO tapes 影响各种商用 REBCO 胶带金属基材机械性能的可能主要因素

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-01-21 DOI: 10.1016/j.physc.2024.1354643

Yan Liu , Hongli Suo , Zili Zhang , Yaotang Ji , Lei Wang , Jianhua Liu , Qiuliang Wang

{"title":"The possible dominant factors in the mechanical properties of the metallic substrates of various commercial REBCO tapes","authors":"Yan Liu , Hongli Suo , Zili Zhang , Yaotang Ji , Lei Wang , Jianhua Liu , Qiuliang Wang","doi":"10.1016/j.physc.2024.1354643","DOIUrl":"10.1016/j.physc.2024.1354643","url":null,"abstract":"<div><div>The metallic substrate of commercial REBCO tapes from eight different manufacturers has been systematically investigated. Tensile properties at both room temperature and 77 K were measured. The grain morphology, size, orientation, dislocation density, and internal stress of the grains on both the cross-section and surface of each tape were studied using EBSD. After an in-depth analysis of the relationship between yield strength and grain size, elemental composition, dislocation density, and twin boundaries, it has been preliminarily confirmed that dislocation density is a possible dominant factor in determining the yield strength of the metallic substrate of commercial REBCO tapes.The kernel average misorientation value (KAM) of the cross-section could be one of the best indicators for evaluating yield strength. Based on this analysis, potential methods for enhancing yield strength are also briefly discussed. This investigation aims to provide valuable insights for researchers to better understand the mechanical properties of REBCO tape.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"629 ","pages":"Article 1354643"},"PeriodicalIF":1.3,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182561","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

Design and test of a canted-cosine-theta superconducting quadrupole magnet for CiADS project

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-01-21 DOI: 10.1016/j.physc.2024.1354646

Yu Liang , Xianjin Ou , Enming Mei , Dongsheng Ni , Luncai Zhou , Zhengnan Han , Yuquan Chen , Wei Wu , Qinggao Yao

{"title":"Design and test of a canted-cosine-theta superconducting quadrupole magnet for CiADS project","authors":"Yu Liang , Xianjin Ou , Enming Mei , Dongsheng Ni , Luncai Zhou , Zhengnan Han , Yuquan Chen , Wei Wu , Qinggao Yao","doi":"10.1016/j.physc.2024.1354646","DOIUrl":"10.1016/j.physc.2024.1354646","url":null,"abstract":"<div><div>For the China Initiative Accelerator Driven System (CiADS) Project, a state-of-the-art Canted-Cosine-Theta (CCT) superconducting quadrupole magnet has been designed to compact the linac. The prototype, with a magnetic field gradient of 40 T/m, is set to eclipse the conventional normal-conducting designs in terms of efficiency and performance. This quadrupole consists of two aluminum alloy formers that produce a high quality quadrupole, with a bore diameter of 60 mm. Ten NbTi wires, insulated with Nylon braid, are wound into the rectangular grooves that are machined by computer numerical control (CNC). The size of grooves is 2 mm wide and 5 mm deep. This paper describes the detailed design based on the CCT concept and reports on the fabrication and coil winding of the magnet prototype. Finally, the magnetic field measurements are carried out within a cryogenic test bath cooled with liquid helium. Due to the resistance of splice joints, the magnet reached 54 % of current margin.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"629 ","pages":"Article 1354646"},"PeriodicalIF":1.3,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182560","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

Weakly coupled type-II superconductivity in LaCoSi2 single crystal

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-01-21 DOI: 10.1016/j.physc.2025.1354655

F. Ito , N. Kabeya , N. Kimura

引用次数: 0

Normal state Landau–Fermi liquidness of pure and doped Sr2RuO4 superconductor

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-01-20 DOI: 10.1016/j.physc.2025.1354651

Luis Craco

{"title":"Normal state Landau–Fermi liquidness of pure and doped Sr2RuO4 superconductor","authors":"Luis Craco","doi":"10.1016/j.physc.2025.1354651","DOIUrl":"10.1016/j.physc.2025.1354651","url":null,"abstract":"<div><div>Based on local density approximation plus dynamical mean-field theory calculations we explore the normal state of pure and doped Sr<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>RuO<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span> superconductor, providing a multiparticle description of intrinsic Landau–Fermi liquidness. Self-energy corrections arising from multi-orbital electron–electron interactions lead to a strongly renormalized electronic state relevant to electron mass enhancement and the emergence of coherent Landau–Fermi liquid quasiparticles at low energies. We shed light on the electronic structure evolution of electron/hole doped Sr<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>RuO<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span> parent compound, showing the orbital-selective electronic state which emerges upon tuning the doping level of Sr<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>RuO<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span> in the vicinity of the van Hove singularities. This work forms an step forward for understanding the manifestation of anisotropic Coulomb interactions and how Landau–Fermi liquidness emerges in the normal state of Sr<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>RuO<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span> superconductor.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"630 ","pages":"Article 1354651"},"PeriodicalIF":1.3,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103659","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

Controllable preparation and superconducting properties of tantalum films with different orientations

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2025-01-20 DOI: 10.1016/j.physc.2025.1354652

Yun Fan , Yuchuan Liu , Yixin Liu , Wei Peng , Yu Wu , Gang Mu , Zhi-Rong Lin

{"title":"Controllable preparation and superconducting properties of tantalum films with different orientations","authors":"Yun Fan , Yuchuan Liu , Yixin Liu , Wei Peng , Yu Wu , Gang Mu , Zhi-Rong Lin","doi":"10.1016/j.physc.2025.1354652","DOIUrl":"10.1016/j.physc.2025.1354652","url":null,"abstract":"<div><div>Transmon qubits based on <span><math><mi>α</mi></math></span>-Ta films have been demonstrated to possess long lifetimes, sparking significant interests among researchers in this material. In this study, we systematically investigated the growth conditions of <span><math><mi>α</mi></math></span>-Ta films on sapphire substrates. By controlling the growth temperature and power, we successfully prepared films with two distinct crystal orientations: <span><math><mi>α</mi></math></span>-Ta [110] and <span><math><mi>α</mi></math></span>-Ta [111]. We found that the growth conditions with low power and low temperature, as well as that with high power and high temperature, are conducive to the growth of <span><math><mi>α</mi></math></span>-Ta [110], while the low power combined with high temperature favors the growth of <span><math><mi>α</mi></math></span>-Ta [111]. The critical transition temperature <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> of the [111]-oriented film increases more gently with the increase of residual resistance ratio (RRR) compared to the [110]-oriented film. Additionally, our result indicates that as the thickness of the <span><math><mi>α</mi></math></span>-Ta [111] film increases, the values of both <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> and RRR rise, with the highest RRR value of 24.6. Our results provide important references for the preparation of high-quality <span><math><mi>α</mi></math></span>-Ta thin films.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"630 ","pages":"Article 1354652"},"PeriodicalIF":1.3,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103657","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