Multigap nodeless superconductivity in Dirac semimetal PdTe

Abstract

PdTe has recently been reported to be a type-II Dirac semimetal while a bulk nodal and surface nodeless superconductivity (SC) has been claimed to coexist. In this work, we applied point-contact spectroscopy (PCS) method to systematically study the superconducting gap in PdTe single crystals with a SC transition temperature $T_c=4.3$ K. The obtained differential conductance curves show a common deviation from a single-gap superconducting behavior and can be better fitted by a two-gap Blonder-Tinkham-Klapwijk model, suggesting the larger gap ${\Delta }_L$ with $2{\Delta }_L$=3.7 $k_B{T}_c$ and the smaller gap ${\Delta }_S$ yielding $2{\Delta }_S$=1.1-2.2 $k_B{T}_c$ with a weak interband scattering. The variations of conductance spectra among different contacts are proposed to be caused by the anisotropy of Fermi surface topology associated with different gaps.

6 pages,5 figures

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