Evidence for two energy gaps and Fermi liquid behavior in SrPt${}_2$As${}_2$ superconductor

Abstract

We report a detailed calorimetric study on single crystals of the 5$d$-transition metal pnictide SrPt2As2 with a superconducting critical temperature $T_c$ $\sim$5K. The peculiar field dependence of the electronic specific heat coefficient $\gamma$ can be decomposed into two linear components. Moreover, the temperature evolution of the electronic specific heat below $T_c$ is best described by a two-gap model. These findings suggest that two energy gaps are associated with the superconductivity. In parallel, we show that the spin-lattice relaxation time $T_1$, through nuclear magnetic resonance measurement, obeys the so-called Korringa relation well. This, along with the $T^2$ dependence of resistivity at low temperatures, points to a Fermi liquid ground state in this material.

5 pages, 4 figures

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Cited by in corpus (12)

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• Effect of Selenium doping on the superconductivity of Nb${}_2$Pd(S${}_{1-x}$Se${}_x$)${}_5$
• Controllable spin-orbit coupling and its influence on the upper critical field in the chemically doped quasi-one-dimensional Nb${}_2$PdS${}_5$ superconductor
• Coexistence of multiple charge-density waves and superconductivity in SrPt2As2 revealed by 75As-NMR/NQR and 195Pt-NMR
• The coexistence of charge density wave and superconductivity in Pt-based layered superconductors : SrPt${}_2$As${}_2$ and LaPt${}_2$Si${}_2$
• Electronic phase diagram in the new BiS2-based Sr1-xLaxFBiS2 system
• Multiband superconductivity in Ta${}_4$Pd${}_3$Te${}_{16}$ with anisotropic gap structure
• Superconductivity and structural distortion in BaPt${}_2$As${}_2$
• Time-reversal-symmetry Breaking in the Superconducting State of ScS
• Nodeless superconductivity in the charge density wave superconductor LaPt${}_2$Si${}_2$
• Possibility of charge density wave transition in SrPt${}_2$Sb${}_2$ superconductor
• Superconductivity in centrosymmetric topological superconductor candidate TaC