Magnetotransport study of the pressure-induced antiferromagnetic phase   in FeSe
  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. 
Taichi Terashima, Naoki Kikugawa, Shigeru Kasahara, Tatsuya Watashige,   Yuji Matsuda, Takasada Shibauchi, Shinya Uji
cond-mat.supr-con cond-mat.str-el