Abstract
With κ - (BEDT - TTF)2 X in mind, we study a half-filled-band Hubbard model on an anisotropic triangular lattice, using an optimization variational Monte Carlo method. As a trial function, we use a state having antiferromagnetic (AF) and d-wave singlet gaps simultaneously, and allow for a band renormalization effect in it. It is found that, at a fairy small value of U / t, a first-order conductor-to-AF insulator transition takes place even for remarkably large strength of frustration. In the optimized insulating states, the staggered magnetization is always robust, even for fully frustrated case. Thereby, a regime of robust superconductor as well as of a nonmagnetic insulator vanishes in this wave function.
Original language | English |
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Pages (from-to) | 648-650 |
Number of pages | 3 |
Journal | Journal of Magnetism and Magnetic Materials |
Volume | 310 |
Issue number | 2 SUPPL. PART 1 |
DOIs | |
Publication status | Published - 2007 Mar |
Keywords
- Anisotropic triangular lattice
- Hubbard model
- Mott transition
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics