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The temperature dependence of the resistivity of ferromagnetic GaMnAs, as-grown or low-temperature-annealed samples is measured from 2 to 290 K. A resistivity minimum is observed with a corresponding temperature T-M around 10 K for each sample. Below T-M, the resistivity exhibits logarithmic temperature dependence, as alpha ln(T), and alpha is independent of the external magnetic field up to 9 T. Such behavior is explained in terms of the Kondo effect arising from the presence of Mn interstitials in the GaMnAs samples. In addition, a well-defined T-squared dependence of resistivity is found in the temperature range between T-M and the Curie temperature (T-C), which is attributed to single magnon scattering. (C) 2005 American Institute of Physics

Resistivity minima and Kondo effect in ferromagnetic GaMnAs films