Geometrical frustration induced (semi-)metal to insulator transition

Details Geometrical frustration induced (semi-)metal to insulator transition Geometrical frustration induced (semi-)metal to insulator transition

2002-09-27

arxiv.org/abs/cond-mat/0209633v2

Phys. Rev. Lett. 89, 226402 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.89.226402

We study the low-energy properties of the geometrically frustrated Hubbard model on a three-dimensional pyrochlore lattice and a two-dimensional checkerboard lattice on the basis of the renormalization group method and mean field analysis. It is found that in the half-filling case, a (semi-)metal to insulator transition (MIT) occurs. Also, in the insulating phase, which has a spin gap, the spin rotational symmetry is not broken, while charge ordering exists. The results are applied to the description of the MIT observed in the pyrochlore system ${\rm Tl_2Ru_2O_7}$.

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