Conventional superconductivity in the doped kagome superconductor Cs(V0.86Ta0.14)3Sb5 from vortex lattice studies

Yaofeng Xie; Nathan Chalus; Zhiwei Wang; Weiliang Yao; Jinjin Liu; Yugui Yao; Jonathan S. White; Lisa M. DeBeer-Schmitt; Jia Xin Yin; Pengcheng Dai; Morten Ring Eskildsen

doi:10.1038/s41467-024-50856-2

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

Yaofeng Xie, Nathan Chalus, Zhiwei Wang, Weiliang Yao, Jinjin Liu, Yugui Yao, Jonathan S. White, Lisa M. DeBeer-Schmitt, Jia Xin Yin, Pengcheng Dai, Morten Ring Eskildsen

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Abstract

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(V_0.86Ta_0.14)₃Sb₅, 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(V_1−xTa_x)₃Sb₅ arises from a conventional Bardeen-Cooper-Schrieffer electron-lattice coupling, different from spin fluctuation mediated unconventional copper- and iron-based superconductors.

Original language	English
Article number	6467
Journal	Nature Communications
Volume	15
Issue number	1
DOIs	https://doi.org/10.1038/s41467-024-50856-2
State	Published - Dec 2024

Funding

The neutron scattering work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under award no. DE-SC0005051 (N.C., M.R.E.) and no. DE-SC0012311 (Y.X, W.Y, P.D), and by the Swiss National Science Foundation (SNSF) Project grant 200021_188707 (J.S.W.). The single-crystal characterization efforts at Rice are supported by the Robert A. Welch Foundation Grant No. C-1839 (P.D.). The work at Beijing Institute of Technology (BIT) was supported by the National Key R&D Program of China Grants No. 2020YFA0308800 and 2022YFA1403400, and by the Beijing Natural Science Foundation Grant No. Z210006 (Z.W., J.L, Y.Y.). Z.W. thanks the Analysis & Testing Center at BIT for assistance in facility support. This work is based on experiments performed at the Swiss Spallation Neutron Source SINQ, Paul Scherrer Institute, Villigen, Switzerland. A portion of this research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

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title = "Conventional superconductivity in the doped kagome superconductor Cs(V0.86Ta0.14)3Sb5 from vortex lattice studies",

abstract = "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)3Sb5, 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)3Sb5 arises from a conventional Bardeen-Cooper-Schrieffer electron-lattice coupling, different from spin fluctuation mediated unconventional copper- and iron-based superconductors.",

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AU - Yao, Weiliang

AU - Liu, Jinjin

AU - Yao, Yugui

AU - White, Jonathan S.

AU - DeBeer-Schmitt, Lisa M.

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AU - Dai, Pengcheng

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N2 - 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)3Sb5, 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)3Sb5 arises from a conventional Bardeen-Cooper-Schrieffer electron-lattice coupling, different from spin fluctuation mediated unconventional copper- and iron-based superconductors.

AB - 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)3Sb5, 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)3Sb5 arises from a conventional Bardeen-Cooper-Schrieffer electron-lattice coupling, different from spin fluctuation mediated unconventional copper- and iron-based superconductors.

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

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