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MetalInsulator Transitions in Degenerate Hubbard Models and A$_x$C$_{60}$  Jian Ping Lu
;  Date: 
9 Jun 1993  Subject:  condmat  Affiliation:  Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina  Abstract:  MottHubbard metalinsulator transitions in $N$fold degenerate Hubbard models are studied within the Gutzwiller approximation. For any rational filling with $x$ (integer) electrons per site it is found that metalinsulator transition occurs at a critical correlation energy $U_c(N,x)=U_c(N,2Nx)=gamma(N,x)ar{epsilon}(N,x)$, where $ar{epsilon}$ is the band energy per particle for the uncorrelated Fermiliquid state and $gamma(N,x)$ is a geometric factor which increases linearly with $x$. We propose that the alkali metal doped fullerides $A_xC_{60}$ can be described by a 3fold degenerate Hubbard model. Using the current estimate of band width and correlation energy this implies that most of ${
m A_xC_{60}}$, at integer $x$, are MottHubbard insulators and ${
m A_3C_{60}}$ is a strongly correlated metal.  Source:  arXiv, condmat/9306025  Services:  Forum  Review  PDF  Favorites 


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