Linear magnetoresistance in the charge density wave state of quasi-two-dimensional rare-earth tritellurides

TL;DR

This study investigates the magnetoresistance behavior in rare-earth tritellurides' charge density wave state, revealing a temperature-dependent crossover from quadratic to linear magnetoresistance explained by quasiparticle scattering near Fermi surface hot spots.

Contribution

The paper introduces a general model explaining linear magnetoresistance in CDW materials considering quasiparticle scattering at Fermi surface hot spots.

Findings

Magnetoresistance shows a crossover from quadratic to linear dependence with temperature and magnetic field.

Linear magnetoresistance is explained by quasiparticle scattering on CDW fluctuations near hot spots.

Experimental data supports the proposed model for magnetoresistance behavior.

Abstract

We report measurements of the magnetoresistance in the charge density wave (CDW) state of rare-earth tritellurides, namely TbTe$_3$ and HoTe$_3$. The magnetic field dependence of magnetoresistance exhibits a temperature dependent crossover between a conventional quadratic law at high $T$ and low $B$ and an unusual linear dependence at low $T$ and high $B$. We present a quite general model to explain the linear magnetoresistance taking into account the strong scattering of quasiparticles on CDW fluctuations in the vicinity of "hot spots" of the Fermi surface (FS) where the FS reconstruction is the strongest.