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Flux trapping in superconducting hydrides under high pressure. 高压下超导氢化物的通量捕获。
arXiv: Superconductivity Pub Date : 2021-04-08 DOI: 10.1016/j.physc.2021.1353916
J. Hirsch, F. Marsiglio
{"title":"Flux trapping in superconducting hydrides under high pressure.","authors":"J. Hirsch, F. Marsiglio","doi":"10.1016/j.physc.2021.1353916","DOIUrl":"https://doi.org/10.1016/j.physc.2021.1353916","url":null,"abstract":"","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79118331","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: 16
Nodal superconductivity and superconducting domes in the topological Kagome metal CsV3Sb5 拓扑Kagome金属CsV3Sb5中的节点超导和超导圆顶
arXiv: Superconductivity Pub Date : 2021-02-16 DOI: 10.21203/RS.3.RS-404809/V1
Shiyan Li, Chen Zhao, Linshu Wang, W. Xia, Q. Yin, J. Ni, Yeyu Huang, Chengpeng Tu, Zicheng Tao, Z. Tu, C. Gong, H. Lei, Yanfeng Guo, Xiaofan Yang
{"title":"Nodal superconductivity and superconducting domes in the topological Kagome metal CsV3Sb5","authors":"Shiyan Li, Chen Zhao, Linshu Wang, W. Xia, Q. Yin, J. Ni, Yeyu Huang, Chengpeng Tu, Zicheng Tao, Z. Tu, C. Gong, H. Lei, Yanfeng Guo, Xiaofan Yang","doi":"10.21203/RS.3.RS-404809/V1","DOIUrl":"https://doi.org/10.21203/RS.3.RS-404809/V1","url":null,"abstract":"Recently superconductivity was discovered in the Kagome metal $A$V$_3$Sb$_5$ ($A$ = K, Rb, and Cs), which has an ideal Kagome lattice of vanadium. These V-based superconductors also host charge density wave and topological nontrivial band structure. Here we report the ultralow-temperature thermal conductivity and high pressure resistance measurements on CsV$_3$Sb$_5$ with $T_c approx$ 2.5 K, the highest among $A$V$_3$Sb$_5$. A finite residual linear term of thermal conductivity at zero magnetic field and its rapid increase in fields suggest nodal superconductivity. By applying pressure, the $T_c$ of CsV$_3$Sb$_5$ increases first, then decreases, showing a clear superconducting dome. Both nodal superconductivity and superconducting dome point to unconventional superconductivity in this V-based superconductor, which could be chiral $d$-wave or odd-parity pairing superconducting state.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79407152","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: 94
Bereziskii-Kosterlitz-Thouless transition in the Weyl system PtBi2 Weyl系统PtBi2的bereziski - kosterlitz - thouless跃迁
arXiv: Superconductivity Pub Date : 2021-02-10 DOI: 10.21203/RS.3.RS-184874/V1
A. Veyrat, V. Labracherie, R. Acharya, D. Bashlakov, F. Caglieris, J. I. Facio, G. Shipunov, L. Gráf, Johannes Schoop, Y. Naidyuk, R. Giraud, J. Brink, B. Buechner, C. Hess, S. Aswartham, J. Dufouleur
{"title":"Bereziskii-Kosterlitz-Thouless transition in the Weyl system PtBi2","authors":"A. Veyrat, V. Labracherie, R. Acharya, D. Bashlakov, F. Caglieris, J. I. Facio, G. Shipunov, L. Gráf, Johannes Schoop, Y. Naidyuk, R. Giraud, J. Brink, B. Buechner, C. Hess, S. Aswartham, J. Dufouleur","doi":"10.21203/RS.3.RS-184874/V1","DOIUrl":"https://doi.org/10.21203/RS.3.RS-184874/V1","url":null,"abstract":"\u0000 Symmetry breaking in topological matter became, in the last decade, a key concept in condensed matter physics to unveil novel electronic states. In this work, we reveal that broken inversion symmetry and strong spin-orbit coupling in trigonal PtBi2 lead to a Weyl semimetal band structure, with unusually robust two-dimensional superconductivity in thin fims. Transport measurements show that high-quality PtBi2 crystals are three-dimensional superconductors (Tc≈600 mK) with an isotropic critical field (Bc≈50 mT). Remarkably, we evidence in a rather thick flake (60 nm), exfoliated from a macroscopic crystal, the two-dimensional nature of the superconducting state, with a critical temperature Tc≈370 mK and highly-anisotropic critical fields. Our results reveal a Berezinskii-Kosterlitz-Thouless transition with TBKT≈310 mK and with a broadening of Tc due to inhomogenities in the sample. Due to the very long superconducting coherence length ξ in PtBi2, the vortex-antivortex pairing mechanism can be studied in unusually-thick samples (at least five times thicker than for any other two-dimensional superconductor), making PtBi2 an ideal platform to study low dimensional superconductivity in a topological semimetal.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79419507","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: 1
Josephson effect of superconductors with J=32 electrons J=32电子超导体的约瑟夫森效应
arXiv: Superconductivity Pub Date : 2021-01-19 DOI: 10.1103/PhysRevB.103.184516
Dakyeong Kim, S. Kobayashi, Y. Asano
{"title":"Josephson effect of superconductors with \u0000J=32\u0000 electrons","authors":"Dakyeong Kim, S. Kobayashi, Y. Asano","doi":"10.1103/PhysRevB.103.184516","DOIUrl":"https://doi.org/10.1103/PhysRevB.103.184516","url":null,"abstract":"The angular momentum of an electron is characterized well by pseudospin with $J=3/2$ in the presence of strong spin-orbit interactions. We study theoretically the Josephson effect of superconductors in which such two $J=3/2$ electrons form a Cooper pair. Within even-parity symmetry class, pseudospin-quintet pairing states with $J=2$ can exist as well as pseudospin-singlet state with $J=0$. We focus especially on the Josephson selection rule among these even-parity superconductors. We find that the selection rule between quintet states is severer than that between spin-triplet states formed by two $S=1/2$ electrons. The effects of a pseudospin-active interface on the selection rule are discussed as well as those of odd-frequency Cooper pairs generated by pseudospin dependent band structures.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74256825","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: 3
Superconductivity in the Z2 kagome metal KV3Sb5 Z2 kagome金属KV3Sb5的超导性
arXiv: Superconductivity Pub Date : 2020-12-16 DOI: 10.1103/PHYSREVMATERIALS.5.034801
B. Ortiz, P. Sarte, E. Kenney, M. Graf, S. Teicher, R. Seshadri, Stephen D. Wilson
{"title":"Superconductivity in the \u0000Z2\u0000 kagome metal \u0000KV3Sb5","authors":"B. Ortiz, P. Sarte, E. Kenney, M. Graf, S. Teicher, R. Seshadri, Stephen D. Wilson","doi":"10.1103/PHYSREVMATERIALS.5.034801","DOIUrl":"https://doi.org/10.1103/PHYSREVMATERIALS.5.034801","url":null,"abstract":"Here we report the observation of bulk superconductivity in single crystals of the two-dimensional kagome metal KV$_3$Sb$_5$. Magnetic susceptibility, resistivity, and heat capacity measurements reveal superconductivity below $T_c = 0.93$K, and density functional theory (DFT) calculations further characterize the normal state as a $mathbb{Z}_2$ topological metal. Our results demonstrate that the recent observation of superconductivity within the related kagome metal CsV$_3$Sb$_5$ is likely a common feature across the AV$_3$Sb$_5$ (A: K, Rb, Cs) family of compounds and establish them as a rich arena for studying the interplay between bulk superconductivity, topological surface states, and likely electronic density wave order in an exfoliable kagome lattice.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89754972","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: 188
Insulating regime of an underdamped current-biased Josephson junction supporting Z3 and Z4 parafermions 支持Z3和Z4参量的欠阻尼偏流约瑟夫森结的绝缘状态
arXiv: Superconductivity Pub Date : 2020-12-16 DOI: 10.1103/PhysRevB.103.L180505
A. Svetogorov, D. Loss, J. Klinovaja
{"title":"Insulating regime of an underdamped current-biased Josephson junction supporting \u0000Z3\u0000 and \u0000Z4\u0000 parafermions","authors":"A. Svetogorov, D. Loss, J. Klinovaja","doi":"10.1103/PhysRevB.103.L180505","DOIUrl":"https://doi.org/10.1103/PhysRevB.103.L180505","url":null,"abstract":"We study analytically a current-biased topological Josephson junction supporting $mathbb{Z}_n$ parafermions. First, we show that in an infinite-size system a pair of parafermions on the junction can be in $n$ different states; the $2pi{n}$ periodicity of the phase potential of the junction results in a significant suppression of the maximal current $I_m$ for an insulating regime of the underdamped junction. Second, we study the behaviour of a realistic finite-size system with avoided level crossings characterized by splitting $delta$. We consider two limiting cases: when the phase evolution may be considered adiabatic, which results in decreased periodicity of the effective potential, and the opposite case, when Landau-Zener transitions restore the $2pi{n}$ periodicity of the phase potential. The resulting current $I_m$ is exponentially different in the opposite limits, which allows us to propose a new detection method to establish the appearance of parafermions in the system experimentally, based on measuring $I_m$ at different values of the splitting $delta$.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74176576","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: 4
Thermally induced spin torque and domain-wall motion in superconductor/antiferromagnetic-insulator bilayers 超导体/反铁磁绝缘体双层中的热诱导自旋力矩和畴壁运动
arXiv: Superconductivity Pub Date : 2020-12-14 DOI: 10.1103/PHYSREVB.103.094506
G. A. Bobkov, I. Bobkova, A. Bobkov, A. Kamra
{"title":"Thermally induced spin torque and domain-wall motion in superconductor/antiferromagnetic-insulator bilayers","authors":"G. A. Bobkov, I. Bobkova, A. Bobkov, A. Kamra","doi":"10.1103/PHYSREVB.103.094506","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.094506","url":null,"abstract":"We theoretically investigate domain wall motion in an antiferromagnetic insulator layer caused by thermally generated spin currents in an adjacent spin-split superconductor layer. An uncompensated antiferromagnet interface enables the two crucial ingredients underlying the mechanism - spin splitting in the superconductor and absorption of spin currents by the antiferromagnet. Treating the superconductor using the quasiclassical theory and the antiferromagnet via Landau-Lifshitz-Gilbert description, we find domain wall propagation along the thermal gradient with relatively large velocities $sim 100$ m/s. Our proposal exploits the giant thermal response of spin-split superconductors in achieving large spin torques towards driving domain wall and other spin textures in antiferromagnets.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73032709","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: 2
Link between superconductivity and a Lifshitz transition in intercalated Bi2Se3 插层Bi2Se3中超导性与Lifshitz跃迁之间的联系
arXiv: Superconductivity Pub Date : 2020-12-12 DOI: 10.1103/PhysRevB.103.174518
A. Almoalem, I. Silber, S. Sandik, M. Lotem, A. Ribak, Y. Nitzav, A. Kuntsevich, O. Sobolevskiy, Yu. G. Selivanov, V. Prudkoglyad, M. Shi, L. Petaccia, M. Goldstein, Y. Dagan, A. Kanigel
{"title":"Link between superconductivity and a Lifshitz transition in intercalated \u0000Bi2Se3","authors":"A. Almoalem, I. Silber, S. Sandik, M. Lotem, A. Ribak, Y. Nitzav, A. Kuntsevich, O. Sobolevskiy, Yu. G. Selivanov, V. Prudkoglyad, M. Shi, L. Petaccia, M. Goldstein, Y. Dagan, A. Kanigel","doi":"10.1103/PhysRevB.103.174518","DOIUrl":"https://doi.org/10.1103/PhysRevB.103.174518","url":null,"abstract":"Topological superconductivity is an exotic phase of matter in which the fully gapped superconducting bulk hosts gapless Majorana surface states protected by topology. Intercalation of copper, strontium or niobium between the quintuple layers of the topological insulator Bi$_2$Se$_3$ increases the carrier density and leads to superconductivity that is suggested to be topological. Here we study the electronic structure of strontium-intercalated Bi$_2$Se$_3$ using angle resolved photoemission spectroscopy (ARPES) and Shubnikov-de Haas (SdH) oscillations. Despite the apparent low Hall number of $sim2 times 10 ^{19}$cm$^{-3}$, we show that the Fermi surface is shaped as an open cylinder with a larger carrier density of $sim 10 ^{20}$cm$^{-3}$. We suggest that superconductivity in intercalated Bi$_2$Se$_3$ emerges with the appearance of a quasi-2D open Fermi surface.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80481811","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: 7
Interface and bulk superconductivity in superconducting heterostructures with enhanced critical temperatures 临界温度提高的超导异质结构中的界面和体超导性
arXiv: Superconductivity Pub Date : 2020-12-11 DOI: 10.1103/PHYSREVB.103.094514
G. Mazza, A. Amaricci, Massimo Capone
{"title":"Interface and bulk superconductivity in superconducting heterostructures with enhanced critical temperatures","authors":"G. Mazza, A. Amaricci, Massimo Capone","doi":"10.1103/PHYSREVB.103.094514","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.094514","url":null,"abstract":"We consider heterostructures obtained by stacking layers of two s-wave superconductors with significantly different coupling strengths, respectively in the weak- and strong-coupling regimes. The weak- and strong-coupling superconductors are chosen with similar critical temperatures for bulk systems. Using dynamical mean-field theory methods, we find an ubiquitous enhancement of the superconducting critical temperature for all the heterostructures where a single layer of one of the two superconductors is alternated with a thicker multilayer of the other. Two distinct physical regimes can be identified as a function of the thickness of the larger layer: (i) an inherently inhomogeneous superconductor characterized by the properties of the two isolated bulk superconductors where the enhancement of the critical temperature is confined to the interface and (ii) a bulk superconductor with an enhanced critical temperature extending to the whole heterostructure. We characterize the crossover between these regimes in terms of the competition between two length scales connected with the proximity effect and the pair coherence.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76067804","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: 2
Absence of superconductivity in topological metal ScInAu$_2$ 拓扑金属ScInAu$_2$中超导性的缺失
arXiv: Superconductivity Pub Date : 2020-12-11 DOI: 10.1016/j.physc.2021.1353928
J. M. DeStefano, G. Marciaga, J. Flahavan, U. Shah, T. Elmslie, M. Meisel, J. Hamlin
{"title":"Absence of superconductivity in topological metal ScInAu$_2$","authors":"J. M. DeStefano, G. Marciaga, J. Flahavan, U. Shah, T. Elmslie, M. Meisel, J. Hamlin","doi":"10.1016/j.physc.2021.1353928","DOIUrl":"https://doi.org/10.1016/j.physc.2021.1353928","url":null,"abstract":"","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77480394","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
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