| Issue |
Europhys. Lett.
Volume 47, Number 1, July 1999
|
|
|---|---|---|
| Page(s) | 116 - 121 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1999-00360-9 | |
| Published online | 01 September 2002 | |
Anisotropic superexchange of a 
Cu-O-Cu bond
1
Joint Institute for Nuclear Research - 141980 Dubna, Moscow Region, Russia
2
Institute for Theoretical Physics, TU Dresden - D-01062 Dresden, Germany
Received:
2
February
1999
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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