Competing ground states of metal-halide ladders
Abstract
Based on a symmetry argument, we investigate the ground-state properties of newly synthesized metal-halide ladder compounds (C8H6N4)[Pt(C2H8N2)X]2(ClO4)4 2H2O (X=Cl, Br, I). Employing a fully dressed two-band Peierls-Hubbard model, we systematically reveal possible charge- or spin-ordered states. Numerical phase diagrams demonstrate a variety of competing Peierls and Mott insulators with particular emphasis on the transition between two types of mixed-valent state of PtII and PtIV driven by varying interchain hopping integrals and Coulomb interactions.
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