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- W2052675620 abstract "Abstract Current theoretical models for metal-nonmetal transitions are reviewed. Variational approaches to the half-filled band Hubbard model are discussed. Another electron-correlation model, the spinless Fermion model, is also discussed. Unlike the Hubbard model, the spinless Fermion model exhibits an insulator-metal transition in the one-dimensional ground state for nonzero interaction strength. A discussion of lattice-distortion models is given. In the distorted phase there are two types of spatial configurations for a magnetic singlet but only one (the polar singlet) forms at the expense of the intrasite repulsion energy. The role of soft phonons in a crystalline distortion is briefly discussed." @default.
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- W2052675620 title "Metal-nonmetal transitions: Theoretical models" @default.
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