Planar spin exchange in LiNiO_2

Abstract

We study the planar spin exchange couplings in LiNiO2 using a perturbative approach. We show that the inclusion of the trigonal crystal field splitting at the Oxygen sites leads to the appearance of antiferromagnetic exchange integrals in deviation from the Goodenough-Kanamori-Anderson rules for this 90 degree bond. That gives a microscopic foundation for the recently observed coexistence of ferromagnetic and antiferromagnetic couplings in the orbitally-frustrated state of LiNiO2. (F. Reynaud et al, Phys. Rev. Lett. 86, 3638 (2001))

latex, revtex4, 6 pages, 3 figures

References in corpus (2)

• Orbital frustration at the origin of the magnetic behavior in LiNiO2
• Orbital effects in manganites

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• Mean-field Study of Charge, Spin, and Orbital Orderings in Triangular-lattice Compounds ANiO2 (A=Na, Li, Ag)
• Magnetic and orbital correlations in a two-site molecule
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