Nodeless superconductivity in the charge density wave superconductor LaPt2Si2
Abstract
We have studied the superconducting gap structure of LaPt2Si2 by measuring the temperature dependence of the London penetration depth shift λ(T) and point contact spectroscopy of single crystals. λ(T) shows an exponential temperature dependence at low temperatures, and the derived normalized superfluid density 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 LaPt2Si2, with moderately strong electron-phonon coupling.
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