Superconductivity, phase separation and
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Yunkiu Bang; C. Castellani; C. Di Castro; M. Grilli; G. Kotliar; R. Raimondi
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Article
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1991
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Elsevier Science
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English
β 300 KB
The three band Hubbard modal with nearest neighbour repulsion is studied in the U = c~ limit using the slave boson technique and the large N expansion. A charge transfer (CT) instability is found like ill weak coupling theory. The CT instability is always associated with a divergin 8 compressibility