SANS Study on Vortex Lattice in CsV<sub>3</sub>Sb<sub>5</sub> and Cs(V<sub>0.86</sub>Ta<sub>0.14</sub>)<sub>3</sub>Sb<sub>5</sub>

ORAL

Abstract

The recent discovery of superconductivity in kagome metals AV3Sb5 (A = K, Rb, Cs) has ignited substantial research interest. To help understand the nature of this intriguing kagome superconductivity, we conducted Small Angle Neutron Scattering (SANS) investigations on the vortex lattice (VL) in CsV3Sb5 and Cs(V0.86Ta0.14)3Sb5, with magnetic fields applied along the crystalline c-axis. Our SANS data revealed a distinct hexagonal shape in the VL diffraction pattern. The field dependence of the VL form factor in Cs(V0.86Ta0.14)3Sb5 can be described by the London model, and the resulting penetration depth and coherence length agree with prior magnetization measurements. In contrast to the exotic charge-4e and charge-6e superconductivity observed in CsV3Sb5, our SANS measurements support charge-2e condensation. Additionally, we observed no reorientation of the VL with changes in magnetic fields and temperatures.

*N.C. and M.R.E. was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, under Award No. DE-SC0005051. This work is based on experiments performed at the Swiss Spallation Neutron Source SINQ, Paul Scherrer Institute, Villigen, Switzerland. Research work at Rice is supported by U.S. NSF-DMR-2100741.

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Presenters

  • Yaofeng Xie

    • Rice University

Authors

  • Yaofeng Xie

    • Rice University

  • Nathan S Chalus

    • University of Notre Dame

  • Jinjin Liu

    • Beijing Institute of Technology

  • Chunruo Duan

    • Rice University

  • Weiliang Yao

    • Rice University

  • Jonathan S White

    • Paul Scherrer Institute

  • Lisa DeBeer-Schmitt

    • ORNL
    • OakRidge National Laboratory

  • Yugui Yao

    • Beijing Institute of Technology

  • Zhiwei Wang

    • Beijing Institute of Technology

  • Pengcheng Dai

    • Rice University

  • Morten R Eskildsen

    • University of Notre Dame