Ferromagnetic moment and spin rotation transitions in tetragonal antiferromagnetic Sr2Cu3O4Cl2

F. C. Chou, Amnon Aharony, R. J. Birgeneau, O. Entin-Wohlman, M. Greven, A. B. Harris, M. A. Kastner, Y. J. Kim, D. S. Kleinberg, Y. S. Lee, Q. Zhu

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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.

Original languageEnglish
Pages (from-to)535-538
Number of pages4
JournalPhysical Review Letters
Issue number3
StatePublished - 20 Jan 1997


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