Charge and Spin Fluctuations, Phonons, and Electron Correlation

  • Duk Joo Kim


The fundamental collective excitations of a metal are known to be charge and spin fluctuations, in addition to phonons. In chapters 6 and 7, we saw aspects of their roles in magnetism, volume, and elasticity properties of a metal. In this chapter we show how the thermodynamic potential and the free energy of a metal can be obtained in terms of these three kinds of collective excitations. This result reconfirms the basis of our discussions given in Chapters 6 and 7. Also we point out some hitherto unknown problems concerning the treatment of spin waves and spin fluctuations.


Hubbard Model Thermodynamic Potential Ferromagnetic State Paramagnetic State Spin Fluctuation 
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Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • Duk Joo Kim
    • 1
  1. 1.Late of Aoyama Gakuin UniversityTokyoJapan

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