Are the localized states in a disordered solid singly occupied?

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Abstract
Mott (1969) and Cohen et al. (1969) have suggested that the bandstructure for some kinds of disordered solids consists of two bands of extended states separated by a region of energy in which only localized states exist. The density of states in this region is a continuous function of energy and the Fermi energy also occurs in this region. The author calls this the M-CFO model. The paramagnetic behaviour of the disordered solid under an external magnetic field is discussed. Unpaired electrons occupying the localized states would cause the Curie-Weiss law to be obeyed at low temperatures.

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