Planar spin exchange in LiNiO_2

Details Planar spin exchange in LiNiO_2 Planar spin exchange in LiNiO_2

2002-07-03

arxiv.org/abs/cond-mat/0207104v1

Physics

Condensed Matter

Strongly Correlated Electrons

latex, revtex4, 6 pages, 3 figures

Scientific paper

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))

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