2007/04/03 by Yuta Hayashi, Masao Ogata · 3 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1143/jpsj.76.053705
published as J.Phys.Soc.Jpn. 76 (2007) 053705. · 4 pages, 4 figures(downsized), To appear in J. Phys. Soc. Jpn.
arxiv created 2007/04/03 · openalex publication_date 2007/05/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Motivated by the observation of a gapless spin liquid state in κ-(BEDT-TTF)2Cu2(CN)3, we analyze the anisotropic triangular lattice S=1/2 Heisenberg model with the resonating valence bond mean-field approximation. Paying attention to the small quasi-one-dimensional anisotropy of the material, we take an approach from one-dimensional (1D) chains coupled with frustrating zig-zag bonds. By calculating one-particle excitation spectra changing anisotropy parameter J'/J from the decoupled 1D chains to the isotropic triangular lattice, we find almost gapless excitations in the wide range from the 1D limit. This one-dimensionalization by frustration is considered to be a candidate for the mechanism of the gapless spin liquid state.