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.

6 pages, 5 figures

References in corpus (10)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Effects of Co substitution on thermodynamic and transport properties and anisotropic $H_{c2}$ in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ single crystals
• Magnetic Penetration Depth in Unconventional Superconductors
• The role of critical current on point contact Andreev Reflection spectrum between a normal metal and a superconductor
• Ambient Pressure Structural Quantum Critical Point in the Phase Diagram of (Ca${}_x$Sr${}_{1-x}$)${}_3$Rh${}_4$Sn${}_{13}$
• Coexistence of Superconductivity and Charge Density Wave in SrPt2As2
• Evolution of charge density wave order and superconductivity under pressure in LaPt${}_2$Si${}_2$
• Superconductivity and structural distortion in BaPt${}_2$As${}_2$
• Superconductivity and multiple pressure-induced phases in BaPt${}_2$As${}_2$

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