Polarization kinetics of the charge density wave state ofK0.3MoO3

Abstract

Transport and structural properties of the charge density wave material K0.3M0O3 have been measured in situ. After cooling to low temperatures in zero electric field, a dc electric field was applied, and simultaneous measurements of the time evolution of the electric current and x-ray scattering peak profiles were carried out. A correlation was observed between the time dependence of the charge transport properties and the superlattice peak intensity.

X-ray-scattering measurements of the transient structure of a driven charge-density wave

“…The distance between the electrical contacts was L = 5 mm. In these measurements the sample was oriented such that the length of the sample in the beam was 0.8 mm, centered at roughly the 3 4 position between the contacts.…”

“…Although a large number of electronic transport experiments have been performed, the results of these experiments are difficult to interpret in terms of microscopic models and time-resolved structural data are limited and restricted primarily to the K 0.3 MO 3 system. 3,4 In order to acquire the data, we developed a time-resolved, high-resolution x-ray scattering system capable of measuring the time-evolution of the structure of the sliding Q 1 charge-density-wave in NbSe 3 as the direction of the driving electric field is reversed. We are able to interpret our data using an equation of motion for the phase of the CDW order parameter which pertains at low temperatures and at large applied fields.…”