title: Possible link of a structurally driven spin flip transition and the insulator-metal transition in the perovskite La(1-x)Ba(x)CoO3.
abstract: The nature of the magnetic ground state near the insulator-metal transition (IMT) in La(1-x)Ba(x)CoO3 was investigated via neutron scattering. Below the critical concentration, x(c)∼0.22, a commensurate antiferromagnetic (AFM) phase appears initially. Upon approaching x(c), the AFM component weakens and a ferromagnetic (FM) ordered phase sets in while in the rhombohedral lattice. At x(c), a spin flip to a new FM structure occurs at the same time as the crystal symmetry transforms to orthorhombic (Pnma). The Pnma phase may be the driving force for the IMT.
authors.affiliation: University of Virginia, Department of Physics, Charlottesville, Virginia 22904, USA.
authors.forename: Peng
authors.initials: P
authors.lastname: Tong
authors.forename: Juan
authors.initials: J
authors.lastname: Yu
authors.forename: Qingzhen
authors.initials: Q
authors.lastname: Huang
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Yamada
authors.forename: Despina
authors.initials: D
authors.lastname: Louca