Abstract
We study the effects of spin-density fluctuation in itinerant electron magnetism. Spin fluctuation is described in terms of an averaged electron-hole polarization bubble dressed with paramagnons in effective random potential. We approximate the polarization bubble by letting all internal paramagnon lines have zero momentum transfer and by taking the Gaussian average over the fluctuating local field. The resultant static susceptibilities calculated for paramagnetic systems agree with experimental data better than those from RPA which is the noninteracting limit of this theory. The high temperature susceptibilities of Ni and Co approximate the Curie-Weiss law for intermediate coupling. \textcopyright{} 1996 The American Physical Society.
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