Temperature-dependent electron mobility and clustering in GaInP2

We present temperature-dependent Hall mobility data μ(T) for GaInP₂, an alloy which shows cation-site ordering under certain growth conditions. We find that samples grown to give high ordering have consistently lower mobilities than samples with low ordering, suggesting that the mobility is limited by cluster scattering by ordered domains. By analyzing μ(T) in terms of a cluster scattering model developed by Harrison, Hauser, and Marsh, we quantify the difference in clustering between the more- and less-ordered states of GaInP₂.