title: Effect of antiferromagnetic spin correlations on lattice distortion and charge ordering in Pr0.5Ca1.5MnO4.
abstract: We use neutron scattering to study the lattice and magnetic structure of the layered half-doped manganite Pr(0.5)Ca(1.5)MnO(4). On cooling from high temperature, the system first becomes charge-and orbital-ordered (CO/OO) near T(CO) = 300 K and then develops checkerboard-like antiferromagnetic (AF) order below T(N) = 130 K. At temperatures above T(N) but below T(CO) (T(N)<T<T(CO)), the appearance of short-range AF spin correlations suppresses the CO/OO-induced orthorhombic strain, contrasting with other half-doped manganites, where AF order has no observable effect on the lattice distortion. These results suggest that a strong spin-lattice coupling and the competition between AF exchange and CO/OO ordering ultimately determines the low-temperature properties of the system.
authors.affiliation: Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996-1200, USA.
authors.forename: Songxue
authors.initials: S
authors.lastname: Chi
authors.forename: F
authors.initials: F
authors.lastname: Ye
authors.forename: Pengcheng
authors.initials: P
authors.lastname: Dai
authors.forename: J A
authors.initials: JA
authors.lastname: Fernandez-Baca
authors.forename: Q
authors.initials: Q
authors.lastname: Huang
authors.forename: J W
authors.initials: JW
authors.lastname: Lynn
authors.forename: E W
authors.initials: EW
authors.lastname: Plummer
authors.forename: R
authors.initials: R
authors.lastname: Mathieu
authors.forename: Y
authors.initials: Y
authors.lastname: Kaneko
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura