Dominant $s$-wave superconducting gap in PdTe${}_2$ observed by tunneling spectroscopy on side-junctions

Abstract

We have fabricated superconductor-normal metal side-junctions with different barrier transparencies out of PdTe${}_2$ crystalline flakes and measured the differential conductance spectra. Modeling our measurements using a modified Blonder Tinkham Klapwijk (BTK) formalism confirms that the superconductivity is mostly comprised of the conventional $s$-wave symmetry. We have found that for junctions with very low barrier transparencies, the junctions can enter a thermal regime, where the critical current becomes important. Adding this to the BTK-model allows us to accurately fit the experimental data, from which we conclude that the superconductivity in the $a$-$b$ plane of PdTe${}_2$ is dominated by conventional $s$-wave pairing.

6 pages, 3 figures, supplementary info

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• Anomalous charge transport of superconducting Cu${}_x$PdTe${}_2$ under high pressure
• Heat capacity of type I superconductivity in the Dirac semimetal PdTe${}_2$
• Superconducting and structural properties of the type-I superconductor PdTe2 under high pressure
• Scattering rate collapse driven by a van Hove singularity in the Dirac semi-metal PdTe${}_2$
• Disorder induced transition from type-I to type-II superconductivity in the Dirac semimetal PdTe${}_2$
• Equal contribution of even and odd frequency pairing to transport across normal metal-superconductor junctions