Abstract
We provide experimental and theoretical evidence for the realization of the Peierls-type structurally distorted state in the quasi-one-dimensional superconductor by a phonon-softening mechanism. The transition from the high- to the final low-temperature phase below 80 K proceeds via an extended intermediate temperature regime between 80 and 150 K 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.
- Received 4 March 2020
- Revised 8 September 2020
- Accepted 9 September 2020
DOI:https://doi.org/10.1103/PhysRevB.102.094109
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