title: Spin-flop transition and the anisotropic magnetoresistance of Pr(1.3-x)La(0.7)CexCuO4: unexpectedly strong spin-charge coupling in the electron-doped cuprates.
abstract: We use transport and neutron-scattering measurements to show that a magnetic-field-induced transition from noncollinear to collinear spin arrangement in adjacent CuO2 planes of lightly electron-doped Pr(1.3-x)La(0.7)CexCuO4 (x=0.01) crystals affects significantly both the in-plane and out-of-plane resistivity. In the high-field collinear state, the magnetoresistance (MR) does not saturate but exhibits an intriguing fourfold-symmetric angular dependence, oscillating from being positive at B//[100] to being negative at B//[110]. The observed MR of more than 30% at low temperatures induced by a modest modification of the spin structure indicates an unexpectedly strong spin-charge coupling in electron-doped cuprates.
authors.affiliation: Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan.
authors.forename: A N
authors.initials: AN
authors.lastname: Lavrov
authors.forename: H J
authors.initials: HJ
authors.lastname: Kang
authors.forename: Y
authors.initials: Y
authors.lastname: Kurita
authors.forename: T
authors.initials: T
authors.lastname: Suzuki
authors.forename: Seiki
authors.initials: S
authors.lastname: Komiya
authors.forename: J W
authors.initials: JW
authors.lastname: Lynn
authors.forename: S-H
authors.initials: SH
authors.lastname: Lee
authors.forename: Pengcheng
authors.initials: P
authors.lastname: Dai
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Ando