Direct Measurement of Spatial Distortions of Charge Density Waves in K0.3MoO3

TL;DR

This study employs advanced X-ray scattering techniques to directly observe spatial distortions in charge density waves of K0.3MoO3 under voltage, revealing new insights into their dynamical behavior and potential applications.

Contribution

It introduces a novel three-wave diffraction method to directly measure spatial distortions of charge density waves, expanding the toolkit for studying periodic media.

Findings

First direct evidence of spatial CDW distortions under voltage

Development of a sensitive three-wave diffraction technique

Potential applicability to other periodic materials

Abstract

Using X-ray scattering and the technique of multiple diffreactions, we revisit the dynamical transition of charge density waves (CDWs) in K0.3MoO3 under applied voltages. In addition to the usual transport and half width (of Bragg peaks) measurements, we also measure the triplet phase by three-wave diffraction, which provides, for the first time, the {\em direct} evidence for the spatial distortions of CDWs. This novel and sensitive technique developed here can be applied to general periodic media, including stripes in high temperature superconductors, and provide a new perspective into interesting phenomena in these materials.