Spin Fluctuation Theory in Weak Ferromagnets

  • Yoshiro Kakehashi
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 175)


The dynamical CPA describes the magnetism from the weak to the strong Coulomb interaction limit. It neglects the nonlocal spin fluctuations, while the self-consistent renormalization (SCR) theory takes into account the non-local spin fluctuations in the weak Coulomb interaction regime. We present in Chap. 5 theoretical framework of the SCR. The SCR is based on the free energy expressed by the dynamical susceptibility. Starting from the RPA susceptibility, we take into account thermal spin fluctuations with use of a sum rule. We elucidate how the Curie–Weiss law in susceptibility occurs in the weak ferromagnets and how much the Curie temperature is reduced by the non-local spin fluctuations in the weak limit.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Yoshiro Kakehashi
    • 1
  1. 1.Faculty of Science, Department of PhysicsUniversity of the RyukyusNishiharaJapan

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