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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。
Pub Date : 2021-04-08 DOI: 10.1016/j.physc.2021.1353916
J. Hirsch, F. Marsiglio
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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
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
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.
最近在Kagome金属$A$V$_3$Sb$_5$ ($A$ = K, Rb和Cs)中发现了超导性,该金属具有理想的钒Kagome晶格。这些v基超导体还具有电荷密度波和拓扑非平凡带结构。本文报道了CsV$_3$Sb$_5$的超低温导热性和耐高压性的测量,$T_c 约为$ 2.5 K,在$A$V$_3$Sb$_5$中最高。零磁场下的热导率的有限剩余线性项及其在磁场中的快速增加表明了节点超导性。施加压力后,CsV$_3$Sb$_5$的T_c$先增大后减小,呈现出明显的超导圆顶。节点超导和超导圆顶都指向这种v基超导体的非常规超导,可能是手性d波或奇宇称对超导态。
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引用次数: 94
Bereziskii-Kosterlitz-Thouless transition in the Weyl system PtBi2 Weyl系统PtBi2的bereziski - kosterlitz - thouless跃迁
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
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.
在过去的十年中,拓扑物质中的对称破缺成为凝聚态物理学中揭示新电子态的关键概念。在这项工作中,我们揭示了三角形PtBi2中反转对称性的破坏和强自旋轨道耦合导致Weyl半金属带结构,在薄膜中具有异常强健的二维超导性。输运测量表明,高质量的PtBi2晶体是具有各向同性临界场(Bc≈50 mT)的三维超导体(Tc≈600 mK)。值得注意的是,我们在宏观晶体剥离的相当厚的薄片(60 nm)中证明了超导态的二维性质,临界温度Tc≈370 mK和高度各向异性的临界场。我们的结果揭示了一个Berezinskii-Kosterlitz-Thouless转变,TBKT≈310 mK,由于样品中的不均匀性,Tc展宽。由于PtBi2的超导相干长度ξ非常长,因此可以在异常厚的样品(至少比任何其他二维超导体厚5倍)中研究涡-反涡配对机制,使PtBi2成为研究拓扑半金属中低维超导性的理想平台。
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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
Pub Date : 2021-01-19 DOI: 10.1103/PhysRevB.103.184516
Dakyeong Kim, S. Kobayashi, Y. Asano
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.
在强自旋-轨道相互作用下,电子的角动量可以用$J=3/2$的赝自旋来表征。我们从理论上研究了超导体的约瑟夫森效应,其中这两个$J=3/2$电子形成一个库珀对。在偶宇称对称类中,可以存在$J=2$的伪自旋-五重配对态和$J=0$的伪自旋-单重态。我们特别关注这些偶宇称超导体中的约瑟夫森选择规则。我们发现五重态之间的选择规则比两个$S=1/2$电子形成的自旋三重态之间的选择规则更严格。讨论了伪自旋活性界面对选择规则的影响,以及由伪自旋相关带结构产生的奇频库珀对的影响。
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引用次数: 3
Superconductivity in the Z2 kagome metal KV3Sb5 Z2 kagome金属KV3Sb5的超导性
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
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.
本文报道了二维kagome金属KV$_3$Sb$_5$的单晶体超导现象。磁化率、电阻率和热容量的测量表明,在T_c = 0.93$K以下的超导性,密度泛函理论(DFT)计算进一步表征了正常状态为$mathbb{Z}_2$拓扑金属。我们的研究结果表明,最近在相关kagome金属CsV$_3$Sb$_5$中观察到的超导性可能是AV$_3$Sb$_5$ (a: K, Rb, Cs)家族化合物的共同特征,并为研究可脱落kagome晶格中块体超导性,拓扑表面状态和可能的电子密度波序之间的相互作用提供了丰富的领域。
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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
Pub Date : 2020-12-16 DOI: 10.1103/PhysRevB.103.L180505
A. Svetogorov, D. Loss, J. Klinovaja
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 $delta$.
我们分析地研究了支持$mathbb{Z}_n$对偶子的电流偏置拓扑约瑟夫森结。首先,我们证明了在无穷大的系统中,结点上的一对参量可以处于$n$不同的状态;对于欠阻尼结的绝缘状态,结相电位的$2pi{n}$周期性导致最大电流的显著抑制$I_m$。其次,我们研究了一个现实的有限大小系统的行为,该系统具有以分裂$delta$为特征的避免平交道口。我们考虑了两种极限情况:当相演化可以被认为是绝热的,这导致有效势的周期性降低;相反的情况下,当朗道-齐纳跃迁恢复相势的$2pi{n}$周期性。由此产生的电流$I_m$在相反的极限上呈指数级不同,这使我们能够提出一种新的检测方法,通过测量$I_m$在不同分裂$delta$值时的实验来建立系统中参量的外观。
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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
Pub Date : 2020-12-14 DOI: 10.1103/PHYSREVB.103.094506
G. A. Bobkov, I. Bobkova, A. Bobkov, A. Kamra
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.
我们从理论上研究了由相邻自旋分裂超导体层中热产生的自旋电流引起的反铁磁绝缘体层中的畴壁运动。无补偿的反铁磁体界面实现了这一机制的两个关键组成部分——超导体中的自旋分裂和反铁磁体对自旋电流的吸收。利用准经典理论和Landau-Lifshitz-Gilbert描述的反铁磁体处理超导体,我们发现畴壁沿热梯度以相对较大的速度传播$sim $ 100$ m/s。我们的建议利用自旋分裂超导体的巨大热响应来实现大的自旋力矩,以驱动反铁磁体中的畴壁和其他自旋织构。
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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
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
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.
拓扑超导是一种奇异的物质相,其中完全间隙的超导体具有受拓扑保护的无间隙马约拉纳表面态。在拓扑绝缘体Bi$_2$Se$_3$的五层之间插入铜、锶或铌,增加了载流子密度,导致超导性,这被认为是拓扑绝缘体。本文利用角分辨光发射光谱(ARPES)和舒布尼可夫-德哈斯(SdH)振荡研究了锶插层Bi$_2$Se$_3$的电子结构。尽管费米表面的霍尔数很低,只有$sim2 乘以10 ^{19}$cm$^{-3}$,但我们发现费米表面的载流子密度较大,为$ sim10 ^{20}$cm$^{-3}$。我们认为,在嵌入的Bi$_2$Se$_3$中,超导性随着准二维开放费米表面的出现而出现。
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引用次数: 7
Interface and bulk superconductivity in superconducting heterostructures with enhanced critical temperatures 临界温度提高的超导异质结构中的界面和体超导性
Pub Date : 2020-12-11 DOI: 10.1103/PHYSREVB.103.094514
G. Mazza, A. Amaricci, Massimo Capone
We consider heterostructures obtained by stacking layers of two s-wave superconductors with significantly different coupling strengths, respectively in the weak- and strong-coupling regimes. The weak- and strong-coupling superconductors are chosen with similar critical temperatures for bulk systems. Using dynamical mean-field theory methods, we find an ubiquitous enhancement of the superconducting critical temperature for all the heterostructures where a single layer of one of the two superconductors is alternated with a thicker multilayer of the other. Two distinct physical regimes can be identified as a function of the thickness of the larger layer: (i) an inherently inhomogeneous superconductor characterized by the properties of the two isolated bulk superconductors where the enhancement of the critical temperature is confined to the interface and (ii) a bulk superconductor with an enhanced critical temperature extending to the whole heterostructure. We characterize the crossover between these regimes in terms of the competition between two length scales connected with the proximity effect and the pair coherence.
我们考虑了两个耦合强度显著不同的s波超导体在弱耦合和强耦合条件下的异质结构。弱耦合超导体和强耦合超导体的临界温度相近。利用动力学平均场理论方法,我们发现,当两种超导体中的一种的单层与另一种较厚的多层交替时,所有异质结构的超导临界温度都普遍提高。两种不同的物理状态可以被识别为较大层厚度的函数:(i)一个固有的非均匀超导体,其特征是两个孤立的体超导体的特性,其中临界温度的提高仅限于界面;(ii)一个临界温度提高的体超导体延伸到整个异质结构。我们描述了这些制度之间的交叉在两个长度尺度之间的竞争与邻近效应和对相干。
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引用次数: 2
Absence of superconductivity in topological metal ScInAu$_2$ 拓扑金属ScInAu$_2$中超导性的缺失
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
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引用次数: 0
期刊
arXiv: Superconductivity
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