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Spin fluctuation contribution to the specific heat of strongly correlated fermions

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Zeitschrift für Physik B Condensed Matter

Abstract

We calculate the free energy of a system of fermions at low temperatures within the Hubbard model using a slave boson representation, which generalizes the approach of Kotliar and Ruckenstein. The mean field approximation is identical to Gutzwiller's solution. The one-loop corrections provide aT 3 lnT spin fluctuation contribution to the specific heat, which reduces for weak coupling to the result of paramagnon theory first derived by Brenig et al.

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Authors and Affiliations

  1. Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, Postfach 6980, D-7500, Karlsruhe 1, Germany

    P. Wölfle

  2. Department of Physics, University of Florida, 32611, Gainesville, Florida, USA

    T. Li

Authors
  1. P. Wölfle
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  2. T. Li
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Dedicated to Professor W. Brenig on the occasion of his 60th birthday

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Wölfle, P., Li, T. Spin fluctuation contribution to the specific heat of strongly correlated fermions. Z. Physik B - Condensed Matter 78, 45–50 (1990). https://doi.org/10.1007/BF01317355

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  • DOI: https://doi.org/10.1007/BF01317355

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