Conventional superconductivity in the doped kagome superconductor Cs(V_0.86Ta_0.14)₃Sb₅ from vortex lattice studies

Xie, Yaofeng1; Chalus, Nathan2; Wang, Zhiwei3,4,5; Yao, Weiliang1; Liu, Jinjin3,4; Yao, Yugui3,4,5; White, Jonathan S.6; DeBeer-Schmitt, Lisa M.7; Yin, Jia-Xin8; Dai, Pengcheng1; Eskildsen, Morten Ring2

2024-07-31

10.1038/s41467-024-50856-2

NATURE COMMUNICATIONS   影响因子和分区

2041-1723

A hallmark of unconventional superconductors is a complex electronic phase diagram where intertwined orders of charge-spin-lattice degrees of freedom compete and coexist. While the kagome metals such as CsV3Sb5 also exhibit complex behavior, involving coexisting charge density wave order and superconductivity, much is unclear about the microscopic origin of the superconducting pairing. We study the vortex lattice in the superconducting state of Cs(V0.86Ta0.14)(3)Sb-5, where the Ta-doping suppresses charge order and enhances superconductivity. Using small-angle neutron scattering, a strictly bulk probe, we show that the vortex lattice exhibits a strikingly conventional behavior. This includes a triangular symmetry with a period consistent with 2e-pairing, a field dependent scattering intensity that follows a London model, and a temperature dependence consistent with a uniform superconducting gap. Our results suggest that optimal bulk superconductivity in Cs(V1-xTax)(3)Sb-5 arises from a conventional Bardeen-Cooper-Schrieffer electron-lattice coupling, different from spin fluctuation mediated unconventional copper- and iron-based superconductors.

SCI

英语

其他

U.S. Department of Energy (DOE)["DE-SC0005051","DE-SC0012311"] ; U.S. Department of Energy, Office of Basic Energy Sciences[200021_188707] ; Swiss National Science Foundation (SNSF)[C-1839] ; Robert A. Welch Foundation["2020YFA0308800","2022YFA1403400"] ; National Key R&D Program of China[Z210006]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:001282384300024

NATURE PORTFOLIO

Web of Science

1.Rice Univ, Dept Phys & Astron, Houston, TX USA
2.Univ Notre Dame, Dept Phys & Astron, Notre Dame, IN 46556 USA
3.Beijing Inst Technol, Ctr Quantum Phys, Sch Phys, Key Lab Adv Optoelect Quantum Architecture & Measu, Beijing, Peoples R China
4.Beijing Inst Technol, Beijing Key Lab Nanophoton & Ultrafine & Optoelect, Beijing 100081, Peoples R China
5.Beijing Inst Technol, Yangtze Delta Reg Acad, Mat Sci Ctr, Jiaxing, Peoples R China
6.Paul Scherrer Inst, PSI Ctr Neutron & Muon Sci, Lab Neutron Scattering & Imaging LNS, Villigen, Switzerland
7.Oak Ridge Natl Lab, Neutron Scattering Div, Large Scale Struct Sect, Oak Ridge, TN USA
8.Southern Univ Sci & Technol, Dept Phys, Shenzhen, Peoples R China

Xie, Yaofeng,Chalus, Nathan,Wang, Zhiwei,et al. Conventional superconductivity in the doped kagome superconductor Cs(V_0.86Ta_0.14)₃Sb₅ from vortex lattice studies[J]. NATURE COMMUNICATIONS,2024,15(1).

Xie, Yaofeng.,Chalus, Nathan.,Wang, Zhiwei.,Yao, Weiliang.,Liu, Jinjin.,...&Eskildsen, Morten Ring.(2024).Conventional superconductivity in the doped kagome superconductor Cs(V_0.86Ta_0.14)₃Sb₅ from vortex lattice studies.NATURE COMMUNICATIONS,15(1).

Xie, Yaofeng,et al."Conventional superconductivity in the doped kagome superconductor Cs(V_0.86Ta_0.14)₃Sb₅ from vortex lattice studies".NATURE COMMUNICATIONS 15.1(2024).