Fully gapped superconductivity without sign reversal in the topological superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>PbTaSe</mml:mi><mml:msub><mml:mrow/><mml:mn>2</mml:mn></mml:msub></mml:math>

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We investigate the superconducting gap function of topological superconductor PbTaSe$_2$. Temperature, magnetic field, and three-dimensional (3D) field-angle dependences of the specific heat prove that the superconductivity of PbTaSe$_2$ is fully-gapped, with two isotropic $s$-wave gaps. The pair-breaking effect is probed by systematically increasing non-magnetic disorders through H$^+$-irradiations. The superconducting transition temperature, $T_{\rm{c}}$, is found to be robust against disorders, which suggests that the pairing should be sign-preserved rather than sign-reversed.

9 pages, 7 figures

Journal

  • Physical Review B

    Physical Review B 102 (2), 2020-07-21

    American Physical Society (APS)

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