Nodeless superconductivity in the charge density wave superconductor LaPt2Si2

Article

关键词: MAGNETIC PENETRATION DEPTH;    COMPETITION;    TRANSITION;    ORDER;   

DOI  :  10.1103/PhysRevB.103.014515

来源: SCIE

【 摘 要 】

We have studied the superconducting gap structure of LaPt2Si2 by measuring the temperature dependence of the London penetration depth shift Delta lambda(T) and point contact spectroscopy of single crystals. Delta lambda X(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 LaPt2Si2, with moderately strong electron-phonon coupling.

【 授权许可】

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