Magnetotransport study of the pressure-induced antiferromagnetic phase in FeSe

TL;DR

This study investigates how applying pressure to FeSe affects its electronic properties, revealing a significant reconstruction of its electronic structure associated with the pressure-induced antiferromagnetic phase transition.

Contribution

It provides detailed measurements of resistivity and Hall resistivity under pressure, showing how the antiferromagnetic transition alters carrier density and mobility in FeSe.

Findings

Abrupt reduction in carrier density at the transition

Significant electronic structure reconstruction

Pressure enhances antiferromagnetic order effects

Abstract

The resistivity $\rho$ and Hall resistivity $\rho_H$ are measured on FeSe at pressures up to $P$ = 28.3 kbar in magnetic fields up to $B$ = 14.5 T. The $\rho(B)$ and $\rho_H(B)$ curves are analyzed with multicarrier models to estimate the carrier density and mobility as a function of $P$ and temperature ($ T\leqslant$ 110 K). It is shown that the pressure-induced antiferromagnetic transition is accompanied by an abrupt reduction of the carrier density and scattering. This indicates that the electronic structure is reconstructed significantly by the antiferromagnetic order.