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Origin of magnetic interactions in Ca3Co2O6

Raymond Frésard, Christian Laschinger, Thilo Kopp, and Volker Eyert
Phys. Rev. B 69, 140405(R) – Published 15 April 2004
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Abstract

We investigate the microscopic origin of the ferromagnetic and antiferromagnetic spin exchange couplings in the quasi-one-dimensional cobalt compound Ca3Co2O6. In particular, we establish a local model which stabilizes a ferromagnetic alignment of the S=2 spins on the cobalt sites with trigonal prismatic symmetry, for a sufficiently strong Hund’s rule coupling on the cobalt ions. The exchange is mediated through an S=0 cobalt ion at the octahedral sites of the chain structure. We present a strong coupling evaluation of the Heisenberg coupling between the S=2 Co spins on a separate chain. The chains are coupled antiferromagnetically through super-superexchange via short O-O bonds.

  • Received 1 September 2003

DOI:https://doi.org/10.1103/PhysRevB.69.140405

©2004 American Physical Society

Authors & Affiliations

Raymond Frésard1,*, Christian Laschinger2,1, Thilo Kopp2, and Volker Eyert3

  • 1Laboratoire Crismat, UMR CNRS-ENSICAEN(ISMRA) 6508, Caen, France
  • 2EPVI, Center for Electronic Correlations and Magnetism, Augsburg University, Augsburg, Germany
  • 3Theoretical Physics II, Augsburg University, 86135 Augsburg, Germany

  • *Email address: Raymond.Fresard@ismra.fr

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Issue

Vol. 69, Iss. 14 — 1 April 2004

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