Significance of nonorthogonality in tight-binding models. II. The possibility of high-Tc superconductivity in intercalation compounds
T. C. Choy, B. A. McKinnon
DOI 10.1103/PhysRevB.52.14539 · Physical Review B
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Abstract
Using the Löwdin transformation from nonorthogonal atomic orbitals to orthogonal Wannier orbitals for the tight-binding model with many-body interactions, we derive the t-J model for graphite. We demonstrate the significance of nonorthogonality on the parameters t and J. We obtain a mean-field phase diagram for the critical temperature Tc versus doping fraction using an auxiliary slave-boson method. We compare the stabilization of the superconducting phase transition via a weak interlayer coupling with a Kosterlitz-Thouless two-dimensional dilute Bose gas condensation. It is concluded that graphite intercalation compounds form a testing ground for the t-J model of high-Tc superconductivity independent of the cuprates.
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