Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 72, Issue 4, Pages 840-853Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.72.840
Keywords
organic charge transfer salts; triangular lattice model; charge ordering; Mott insulator; Coulomb interaction; BEDT-TSF; BEDT-TTF; Hartree approximation
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This paper presents a unified theoretical picture of quasi-two-dimensional organic conductors in a new minimal model based on an anisotropic triangular lattice. These materials exhibit abundance of low-temperature physics, where the systematic understanding was tagging behind respective studies. This is ascribed to a variety in the electronic structure stemming from different arrangements of molecules, i.e. polytypes. We provide a way of mapping different polytypes into our minimal model, where a choice of four different band parameters enables the simple relationships among them. The generalized ground state phase diagram of this model on the plane of these band parameters is obtained from the mean-field calculations with on-site and inter-site Coulomb interactions. By associating the actual materials with the results of calculations, their ground state differences are systematically understood.
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