title: Spin correlations in a simple cubic antiferromagnet L1(2)-type Pt(3)Fe.
abstract: Magnetic diffuse scattering of neutrons was studied for a simple cubic antiferromagnet L1(2)-type Pt(3)Fe alloy in a paramagnetic phase. In order to visualize the physics, the data were analyzed using a localized spin model and effective exchange coupling parameters were determined. The result shows a special feature of exchange couplings; the first neighbor coupling constant J(1) has almost the same value and the same sign as that of the second neighbor J(2). This fact explains well coexistence of the (1/2 1/2 0)-type and (1/2 0 0)-type magnetic structures in the low temperature phase of Pt(3)Fe alloy.
authors.affiliation: School of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku, Tokyo 169-8555, Japan.
authors.forename: Ryusuke
authors.initials: R
authors.lastname: Matsui
authors.forename: Yorihiko
authors.initials: Y
authors.lastname: Tsunoda