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

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.

arXiv comment6 pages, 5 figures

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Cited by in corpus (2)

• Non-Conventional Critical Behavior and Q-dependent Electron-Phonon Coupling Induced Phonon Softening in the CDW Superconductor LaPt2Si2
• Structural Evolution and Onset of the Density Wave Transition in the CDW Superconductor LaPt${}_2$Si${}_2$ Clarified with Synchrotron XRD