Orbital Frustration at the Origin of the Magnetic Behavior in LiNiO 2
2001; American Physical Society; Volume: 86; Issue: 16 Linguagem: Inglês
10.1103/physrevlett.86.3638
ISSN1092-0145
AutoresF. Reynaud, Damien Mertz, Franck Celestini, Jean‐Marc Debierre, A. M. Ghorayeb, P. Šimon, A. Stepanov, J. Voiron, Claude Delmas,
Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoWe 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) approximately 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.
Referência(s)