Abstract
Magnetic susceptibility measurements of over the concentration range and the temperature range 77-295 K are presented. Measurements were performed using both Faraday balance and Schumacher-Slichter magnetic resonance methods. Total susceptibilities were separated into three components: atomic core diamagnetism, local-moment Curie-law paramagnetism, and Pauli paramagnetism. From the onset of the Pauli term as a function of (As) concentration, the critical dopant concentration for the semiconductormental transition is determined. The Fermi-surface density of states obtained from the Pauli term is analyzed in terms of various band-structure models. Alternate explanations of anomalously small Curie terms in lightly doped, semiconducting are discussed, including the possibility of soliton-localized impurity states induced by charge transfer doping.
- Received 29 January 1979
DOI:https://doi.org/10.1103/PhysRevB.20.223
©1979 American Physical Society