Nodeless superconductivity in the charge density wave superconductor LaPt$_2$Si$_2$

Z. Y. Nie; L. C. Yin; A. Thamizhavel; A. Wang; B. Shen; L. Q. Che; F. Du; Z. Hossain; M. Smidman; X. Lu; H. Q. Yuan

doi:10.1103/PhysRevB.103.014515

Nodeless superconductivity in the charge density wave superconductor LaPt$_2$Si$_2$

Superconductivity 2021-01-28 v1

Authors: Z. Y. Nie , L. C. Yin , A. Thamizhavel , A. Wang , B. Shen , L. Q. Che , F. Du , Z. Hossain , M. Smidman , X. Lu , H. Q. Yuan

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Abstract

We have studied the superconducting gap structure of LaPt $_2$ Si $_2$ by measuring the temperature dependence of the London penetration depth shift $\Delta\lambda(T)$ and point contact spectroscopy of single crystals. $\Delta\lambda(T)$ shows an exponential temperature dependence at low temperatures, and the derived normalized superfluid density $\rho_{s}(T)$ can be well described by a single-gap s-wave model. The point-contact conductance spectra can also be well fitted by an s-wave Blonder-Tinkham-Klapwijk model, where the gap value shows a typical BCS temperature and magnetic field dependence consistent with type-II superconductivity. These results suggest fully gapped superconductivity in LaPt $_2$ Si $_2$ , with moderately strong electron-phonon coupling.

Keywords

nodeless superconductivity charge density wave LaPt2Si2 london penetration depth point contact spectroscopy s-wave gap

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@article{arxiv.2101.11280,
  title  = {Nodeless superconductivity in the charge density wave superconductor LaPt$_2$Si$_2$},
  author = {Z. Y. Nie and L. C. Yin and A. Thamizhavel and A. Wang and B. Shen and L. Q. Che and F. Du and Z. Hossain and M. Smidman and X. Lu and H. Q. Yuan},
  journal= {arXiv preprint arXiv:2101.11280},
  year   = {2021}
}

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6 pages, 5 figures

Nodeless superconductivity in the charge density wave superconductor LaPt$_2$Si$_2$

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