title: Magnetotransport properties in K(0.50)CoO(2) single crystals.
abstract: We have measured susceptibility and angle-dependent magnetoresistance (AMR) on K(0.50)CoO(2) single crystals. A possible magnetic structure similar to that of Na(0.5)CoO(2), a G-type anti-ferromagnetic (AF) structure (both in-plane and inter-plane are AF), is proposed. At ∼20 K, a loop is observed between zero-field-cooled (ZFC) and field-cooled (FC) susceptibility. The absolute value of magnetoresistance (MR) at 20 K is much larger than other cases with H applied within the ab plane. This could arise from the magnetic field being applied in the ab plane, leading to spin-flop of the small magnetic moment of Co(3.5-δ) sites at 20 K to form in-plane ferromagnetic ordering, as observed in Na(0.52)CoO(2).
authors.affiliation: Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
authors.forename: H
authors.initials: H
authors.lastname: Chen
authors.forename: T
authors.initials: T
authors.lastname: Wu
authors.forename: Y L
authors.initials: YL
authors.lastname: Xie
authors.forename: R H
authors.initials: RH
authors.lastname: Liu
authors.forename: G
authors.initials: G
authors.lastname: Wu
authors.forename: X F
authors.initials: XF
authors.lastname: Wang
authors.forename: X H
authors.initials: XH
authors.lastname: Chen