Anomalous Residual Surface Conductivity in a Superconductor with Strong Spin-Orbit Coupling

Conventional BCS superconductors are expected to exhibit a conductivity with vanishing dissipation with decreasing temperature. While bulk physical properties measurements indicate PdPb$_{2}$ is a conventional superconductor with a $T_c$ of 3.0 K, measurements of surface impedance through the microw...

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Main Authors Chamorro, J. R, Chauhan, P, Sun, C, Varnava, N, Winiarski, M. J, Ng, N, Vivanco, H. K, Pressley, L. A, Pasco, C. M, Vanderbilt, D, Li, Yi, Armitage, N. P, McQueen, T. M
Format Journal Article
LanguageEnglish
Published 20.12.2021
Subjects
Physics - Superconductivity
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Summary:Conventional BCS superconductors are expected to exhibit a conductivity with vanishing dissipation with decreasing temperature. While bulk physical properties measurements indicate PdPb$_{2}$ is a conventional superconductor with a $T_c$ of 3.0 K, measurements of surface impedance through the microwave cavity perturbation technique indicate a large, non-vanishing dissipative component below $T_c$ that is at odds with conventional superconductivity. We demonstrate PdPb$_2$ to be a possible topological superconductor with a fully gapped bulk and a dissipative Majorana fluid surface.
DOI:10.48550/arxiv.2112.10840