Abstract
Half-filled-band extended Hubbard models on anisotropic triangular lattices are studied using a variational Monte Carlo method, with κ-(BEDT-TTF)2X in mind. Mott transitions are always observed at certain U. For the isotropic case, an antiferromagnetic (AF) order with 120° spin structure becomes dominant in the insulating regime. Introduction of intersite Coulomb interaction (V) only slightly affects the AF order, but a threefold charge order appears when V / U ≳ frac(1, 3). As for superconductivity, d2-, dxy-, and f2-wave pairing states, which form pairs on next-nearest-neighbor sites, are stabilized with respect to the normal state for large V.
Original language | English |
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Pages (from-to) | 3372-3374 |
Number of pages | 3 |
Journal | Journal of Physics and Chemistry of Solids |
Volume | 69 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2008 Dec |
Keywords
- A. Organic compounds
- A. Superconductors
- D. Electrical properties
- D. Magnetic properties
- D. Superconductivity
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics