Are the localized states in a disordered solid singly occupied?

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.