Large linear magnetoresistance and magnetothermopower in layered SrZnSb$_2$

TL;DR

This study reveals large linear magnetoresistance and enhanced magnetothermopower in layered SrZnSb$_2$, explained by Dirac states and quantum effects in its quasi-two-dimensional structure.

Contribution

It demonstrates the coexistence of large linear magnetoresistance and magnetothermopower in SrZnSb$_2$, highlighting the role of Dirac states in its magnetotransport properties.

Findings

Magnetoresistance reaches ~300% at 2 K in 9 T.

Crossover from semiclassical to linear magnetoresistance with increasing field.

Magnetotransport explained by Dirac states and quantum effects.

Abstract

We report the large linear magnetoresistance ($\sim 300\%$ in 9 T field at 2 K) and magnetothermopower in layered SrZnSb$_2$ crystal with quasi-two-dimensional Sb layers. A crossover from the semiclassical parabolic field dependent magnetoresistance to linear field dependent magnetoresistance with increasing magnetic field is observed. The magnetoresistance behavior can be described very well by combining the semiclassical cyclotron contribution and the quantum limit magnetoresistance. Magnetic field also enhances the thermopower. Our results can be well understood by the magnetotransport of Dirac states in the bulk band structure.