Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-01-05
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
The metal-insulator transition of the quarter-filled Hubbard model on triangular lattice is studied at the mean field level. We find a quasi-one dimensional metallic state with a collinear magnetic order competes closely with an insulating state with a non-coplanar magnetic order for both signs of the hopping integral $t$. In the strong correlation regime($U/|t|\gg1$), it is found that the metal-insulator transition of the system occurs in a two-step manner. The quasi-one dimensional metallic state with collinear magnetic order is found to be stable in an intermediate temperature region between the paramagnetic metallic phase and the non-coplanar insulating phase. Possible relevance of these results to the physics of metal-insulator transition in $Na_{0.5}CoO_{2}$ is discussed.
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