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arXiv · 1901.04227

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

J. A. Voerman·J. C. de Boer·T. Hashimoto·Yingkai Huang·Chuan Li·A. Brinkman
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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.

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J. A. Voerman, J. C. de Boer, T. Hashimoto, Yingkai Huang, Chuan Li, A. Brinkman. 2019-01-31. Dominant $s$-wave superconducting gap in PdTe$_2$ observed by tunneling spectroscopy on side-junctions. https://doi.org/10.1103/physrevb.99.014510

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