Compton scattering studies of the electron momentum distribution in indiumphosphide

The electron momentum anisotropy of indium phosphide has been studied by me asuring the directional Compton profiles of indium phosphide single crystal s with the use of radiation from an, Am-241 gamma source. Three different s amples, cut along the [100], [110] and [111] planes, were used. The experim ental anisotropy has been compared with the results based on the linear com bination of Gaussian orbitals (LCGO) method. The agreement is very good wit h our theoretical results. It is found that the extrema appearing in the de pendences on q of the anisotropies have an intimate connection with the bon ding properties of the semiconductor. A self-consistent, all-electron, loca l density calculation for the partial density of states, total density of s tates and the charge analysis is also presented here. (C) 1999 Elsevier Sci ence Ltd. All rights reserved.