Optical and Magnetic Investigations of the Localized States in Semiconducting Glasses

Abstract

We measured optical absorption and magnetic susceptibility of amorphous ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$ as a function of temperature. An exponential variation of absorption constant with photon energy was found in the range $0.09<\ensuremath{\alpha}<0.5$ ${\mathrm{cm}}^{\ensuremath{-}1}$. A Curie term in the susceptibility was shown to be characteristic of disorder in the vitreous material. A model relating the weak absorption tail to the susceptibility requires highly localized states having an exponential energy distribution in the gap.