Evolution of charge density wave order and superconductivity under pressure in LaPt${}_2$Si${}_2$

Abstract

We report measurements of the electrical resistivity and ac magnetic susceptibility of single crystalline LaPt${}_2$Si${}_2$ under pressure, in order to investigate the interplay of superconductivity and CDW order. LaPt${}_2$Si${}_2$ exhibits a first order phase transition from a tetragonal to orthorhombic structure, accompanied by the onset of CDW order below $T_{\mathrm{CDW}}$ = 76 K, while superconductivity occurs at a lower temperature of $T_{\mathrm{c}}$ = 1.87 K. We find that the application of pressure initially suppresses the CDW transition, but enhances $T_{\mathrm{c}}$. At pressures above 2.4 GPa, CDW order vanishes, while both $T_{\mathrm{c}}$ and the resistivity $A$-coefficient reach a maximum value around this pressure. Our results suggest that the occurrence of a superconducting dome can be accounted for within the framework of BCS theory, where there is a maximum in the density of states upon the closure of the CDW gap.

arXiv comment6 pages, 5 figures

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• Structural phase transitions and superconductivity in the Heusler intermetallics $X$Pd${}_2$Sn ($X$ = Ti, Zr, Hf)
• Nodeless superconductivity in the charge density wave superconductor LaPt${}_2$Si${}_2$
• Interplay between charge density wave and superconductivity in multi-band systems with inter-band Coulomb interaction
• Non-Conventional Critical Behavior and Q-dependent Electron-Phonon Coupling Induced Phonon Softening in the CDW Superconductor LaPt2Si2
• Superconductivity in CuIr2-xAlxTe4 telluride chalcogenides
• Effects of external pressure on the narrow gap semiconductor Ce${}_3$Cd${}_2$As${}_6$