Orbital frustration at the origin of the magnetic behavior in LiNiO2

Details Orbital frustration at the origin of the magnetic behavior in LiNiO2 Orbital frustration at the origin of the magnetic behavior in LiNiO2

2001-02-27

arxiv.org/abs/cond-mat/0102501v1

Physics

Condensed Matter

Materials Science

5 pages, 5 figures, RevTex, accepted in PRL

Scientific paper

10.1103/PhysRevLett.86.3638

We report on the ESR, magnetization and magnetic susceptibility measurements performed over a large temperature range, from 1.5 to 750 K, on high-quality stoichiometric LiNiO2. We find that this compound displays two distinct temperature regions where its magnetic behavior is anomalous. With the help of a statistical model based on the Kugel'-Khomskii Hamiltonian, we show that below T_of ~ 400 K, an orbitally-frustrated state characteristic of the triangular lattice is established. This then gives a solution to the long-standing controversial problem of the magnetic behavior in LiNiO2.

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