Glass transition in the charge density wave system K$_{0.3}$MoO$_{3}$

TL;DR

This study investigates the dielectric properties of the CDW system K$_{0.3}$MoO$_{3}$, revealing glass-like relaxational processes below 80 K, suggesting a potential universal glass transition feature in CDW materials.

Contribution

It provides experimental evidence of glass-like relaxations in K$_{0.3}$MoO$_{3}$ and compares these to similar phenomena in other CDW systems, proposing universality.

Findings

Two relaxational processes freeze below 80 K

Resemblance to glass dielectric response

Possible universal feature in CDW systems

Abstract

Low frequency dielectric spectroscopy and thermally stimulated discharge measurements of charge density wave (CDW) system K$_{0.3}$MoO$_{3}$ are presented. Below 80 K two distinct relaxational processes are observed, which freeze at finite temperatures bearing close resemblance to the phenomenology of the dielectric response of glasses. We compare our results to the case of o-TaS$_{3}$ in which the glass transition on the level of CDW superstructure has been recently reported\cite{Star02} and discuss the possibility that it is a universal feature of CDW systems.