Volume 47, Number 1, July 1999
|Page(s)||116 - 121|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Anisotropic superexchange of a Cu-O-Cu bond
Joint Institute for Nuclear Research - 141980 Dubna, Moscow Region, Russia
2 Institute for Theoretical Physics, TU Dresden - D-01062 Dresden, Germany
Accepted: 29 April 1999
The magnetic anisotropy of a rectangular Cu-O-Cu bond is investigated in second order of the spin-orbit interaction. Such a bond is characteristic for cuprates having edge sharing chains, and exists also in the plane or in ladder compounds. For a ferromagnetic coupling between the copper spins an easy axis is found perpendicular to the copper oxygen plaquettes in agreement with the experimental spin structure of . In addition, a pseudodipolar interaction is derived. Its estimation in the case of the plane (which is present for instance in or ) gives a value which is, however, two orders of magnitude smaller than the usual dipole-dipole interaction.
PACS: 75.30.Gw – Magnetic anisotropy / 74.72.Jt – Other cuprates / 71.70.Ej – Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
© EDP Sciences, 1999
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