Mobility and its temperature dependence in LSCO: viscous motion?

TL;DR

This paper investigates charge mobility in underdoped LSCO, proposing that strong fluctuations cause dissipative motion and explaining the temperature-dependent Hall angle through thermally activated carriers.

Contribution

It offers a new interpretation of the Hall angle's temperature dependence by linking it to thermally activated carriers in a fluctuating environment.

Findings

Charge carriers exhibit thermally activated behavior above T_c.

The Hall angle's temperature dependence is explained by fluctuating carrier density.

Localization effects are negligible in the considered temperature range.

Abstract

We argue that charges in underdoped La$_{2-x}$Sr$_{x}$CuO$_{4}$ move in a dissipative environment of strong spatial and temporal fluctuations. The unusual temperature dependence of the Hall angle known as "the separation of lifetimes" is reinterpreted and attributed to the appearance of the thermally activated component in the effective number of carriers with the temperature increase. We consider the temperature interval above $T_{c}$ where localization effects can be neglected.