Magnetotransport study of the pressure-induced antiferromagnetic phase in FeSe

Abstract

The resistivity $\ddot{I}$ and Hall resistivity $\ddot{I}{}_H$ are measured on FeSe at pressures up to $P$ = 28.3 kbar in magnetic fields up to $B$ = 14.5 T. The $\ddot{I}(B)$ and $\ddot{I}{}_H(B)$ curves are analyzed with multicarrier models to estimate the carrier density and mobility as a function of $P$ and temperature ($T⩽$ 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.

6 pages, 5 figures + SM ( 2 pages, 2 figures)