Evidence for a soft-phonon-mode-driven Peierls-type distortion in Sc${}_3$CoC${}_4$

Abstract

We provide experimental and theoretical evidence for the realization of the Peierls-type structurally distorted state in the quasi-one-dimensional superconductor Sc${}_3$CoC${}_4$ by a phonon-softening mechanism. The transition from the high- to the final low-temperature phase below 80K proceeds via an extended intermediate temperature regime between 80K and 150K characterized by phonon-driven atom displacements. In support of the low-dimensional character of the title compound we find a highly anisotropic correlation-length of these dynamic distortions.

9 pages, 7 figures and supporting information

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• Competition between the structural phase transition and superconductivity in Ir${}_{1-x}$Pt${}_x$Te${}_2$ as revealed by pressure effects