Predominant Magnetic States in Hubbard Model on Anisotropic Triangular Lattices

Details Predominant Magnetic States in Hubbard Model on Anisotropic Triangular Lattices Predominant Magnetic States in Hubbard Model on Anisotropic Triangular Lattices

2007-11-12

arxiv.org/abs/0711.1702v2

Physical Review B 77, 214505 (2008)

Physics

Condensed Matter

Superconductivity

11 pages, 14 figures

Scientific paper

10.1016/j.jmmm.2006.10.106

Using an optimization variational Monte Carlo method, we study the half-filled-band Hubbard model on anisotropic triangular lattices, as a continuation of the preceding study [J. Phys. Soc. Jpn 75, 074707 (2006)]. We introduce two new trial states: (i) A coexisting state of (\pi,\pi)-antiferromagnetic (AF) and a d-wave singlet gaps, in which we allow for a band renormalization effect, and (ii) a state with an AF order of 120^\circ spin structure. In both states, a first-order metal-to-insulator transition occurs at smaller U/t than that of the pure d-wave state. In insulating regimes, magnetic orders always exist; an ordinary (\pi,\pi)-AF order survives up to t'/t\sim 0.9 (U/t=12), and a 120^\circ-AF order becomes dominant for t'/t \gsim 0.9. The regimes of the robust superconductor and of the nonmagnetic insulator the preceding study proposed give way to these magnetic domains.

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