Effect of antiferromagnetic spin correlations on lattice distortion and charge ordering in Pr0.5Ca1.5MnO4.
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.
Chi
Songxue
S
Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996-1200, USA.
Ye
F
F
Dai
Pengcheng
P
Fernandez-Baca
J A
JA
Huang
Q
Q
Lynn
J W
JW
Plummer
E W
EW
Mathieu
R
R
Kaneko
Y
Y
Tokura
Y
Y