Multigap Superconductivity in a charge density wave superconductor LaPt2Si2

Abstract

The superconducting gap structure of a charge density wave (CDW) superconductor LaPt${}_2$Si${}_2$ ($T_c$ = 1.6~K) having a quasi two dimensional crystal structure has been investigated using muon spin rotation/relaxation ($\mu$SR) measurements carried out in transverse field (TF), zero field (ZF) and longitudinal field (LF) geometries. Rigorous analysis of TF-$\mu$SR spectra in the superconducting state corroborates that the temperature dependence of the effective penetration depth, ${\lambda }_L$, derived from muon spin depolarization, fits to an isotropic $s+s-$wave model suggesting that the Fermi surface contains two gaps of different magnitude rather than an isotropic gap expected for a conventional $s-$wave superconductor. On the other hand, ZF $\mu$SR data do not show any significant change in muon spin relaxation rate above and below the superconducting transition indicating the fact that time-reversal symmetry is preserved in the system.

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• Superconducting gap symmetry of the noncentrosymmetric superconductor W3Al2C
• Unconventional pressure dependence of the superfluid density in the nodeless topological superconductor $\alpha$-PdBi${}_2$
• Features of Excess Conductivity Behavior in a Magnetic Superconductor Dy${}_{0.6}$Y${}_{0.4}$Rh${}_{3.85}$Ru${}_{0.15}$B${}_4$
• Nodeless superconductivity in the charge density wave superconductor LaPt${}_2$Si${}_2$
• 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
• Type-II superconductivity in the Dirac semimetal PdTe2
• Superconductivity in the layered cage compound Ba3Rh4Ge16
• Time reversal invariant single gap superconductivity with upper critical field larger than Pauli limit in NbIr${}_2$B${}_2$