Ferromagnetic moment and spin rotation transitions in tetragonal antiferromagnetic Sr2Cu3O4Cl2
Journal
Physical Review Letters
Journal Volume
78
Journal Issue
3
Pages
535-538
Date Issued
1997
Author(s)
Aharony, A.
Birgeneau, R. J.
Entin-Wohlman, O.
Greven, M.
Harris, A. B.
Kastner, M. A.
Kim, Y. J.
Kleinberg, D. S.
Lee, Y. S.
Zhu, Q.
Abstract
Sr2Cu3O4Cl2 is a variant of the lamellar copper oxides, containing an extra Cu2+ ion in the center of every second plaquette of the square CuO2 lattice. The two types of Cu form interpenetrating Heisenberg antiferromagnets, which order at 380 and 40 K. Magnetization measurements yield a small spontaneous ferromagnetic moment below 380 K and two spin rotation transitions. The results are explained in detail by a pseudodipolar coupling between the two Cu lattices. A quantitative analysis of the data yields several previously unknown microscopic coupling constants, relevant to other lamellar, chain, and ladder copper oxides. © 1997 The American Physical Society.
Type
journal article