Orbitally relieved magnetic frustration in NaVO2

Details Orbitally relieved magnetic frustration in NaVO2 Orbitally relieved magnetic frustration in NaVO2

2009-04-28

arxiv.org/abs/0904.4401v4

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted by PRB

Scientific paper

The magnetic properties of NaVO2 are investigated using full-potential linearized augmented plane wave method. We perform calculations for three structures. For the rhombohedral structure at 100 K, the t2g orbitals of V ions are split into upper a1g and lower e'g orbitals by a trigonal distortion of compression. For the monoclinic structure at 91.5 K, the system behaves like a frustrated spin lattice with spatially anisotropic exchange interactions. For another monoclinic structure at 20 K, the magnetic frustration is relieved by a lattice distortion which is driven by a certain orbital ordering, and the long-range magnetic ordering is thus formed. Moreover, the small magnetic moment originates from the compensation oforbital moment for the spin moment.

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