Abstract
The positive magnetoconductivity Delta sigma (B) of InP near the metal-insulator transition (MIT) was measured as a function of the conduction electron concentration and the compensation ratio. Starting deep within the metallic regime the charge carrier density of the sample was reduced stepwise below the critical value of the MIT by fast neutron irradiation due to the acceptor-like nature of the irradiation defects. Up to being exposed to a fast neutron dose of phi tf=1.4*1016 cm-2 the sample behaved in a metallic fashion, and subsequent to each irradiation step the inelastic scattering time was deduced from the slope of the Delta sigma =f(B2) curves in the temperature range 2 K<T<6 K. The temperature dependence of the inelastic scattering time was found to vary as T-1, in agreement with a theory developed by Isawa. After the radiation-induced crossover into the insulating regime the Delta sigma varies as B2 dependence was still observed. In this case the temperature dependence of the negative magnetoresistance was of the form Delta rho / rho varies as T- alpha with alpha -1.26. The influence of the compensation ratio on the measured properties is discussed.
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