| Issue |
Europhys. Lett.
Volume 44, Number 4, November II 1998
|
|
|---|---|---|
| Page(s) | 491 - 497 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00499-9 | |
| Published online | 01 September 2002 | |
Orbital polarization in 
and 
1
Institute of Metal Physics, GSP-170 - Ekaterinburg, Russia
2
Laboratory of Applied and Solid State Physics, Materials Science Centre, University of Groningen - Nijenborgh 4, 9747 AG Groningen, The Netherlands
Received:
8
December
1998
Accepted:
22
September
1998
We present a band structure study of orbital polarization and
ordering in the two-dimensional triangular-lattice transition metal
compounds and . It is found that while in
the degeneracy of 
orbitals is lifted due to the trigonal
symmetry of the crystal and the strong on-site Coulomb interaction,
in orbital degeneracy remains and orbital ordering
corresponding to the trimerization of the two-dimensional lattice develops.
PACS: 71.15.Mb – Density functional theory, local density approximation / 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.20.-b – Electron density of states and band structure of crystalline solids
© EDP Sciences, 1998
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