Understanding heavy Fermion from generalized statistics

Y. Kaupp, S. Liraki, D. Tayurskii, Artur Useinov, A. El Kaabouchi, L. Nivanen, B. Minisini, F. Tsobnang, A. Le Méhauté, Q. A. Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Heavy electrons in superconducting materials are widely studied with the Kondo lattice t - J model. Numerical results have shown that the Fermi surface of these correlated particles undergoes a flattening effect according to the coupling degree J. This behaviour is not easy to understand from the theoretical point of view within standard Fermi - Dirac statistics and non-standard theories such as fractional exclusion statistics for anyons and Tsallis nonextensive statistics. The present work is an attempt to account for the heavy electron distribution within incomplete statistics (IS) which is developed for complex systems with interactions which make the statistics incomplete such that Σ i=1 w P i q=1. The parameter q, when different from unity, characterizes the incompleteness of the statistics. It is shown that the correlated electrons can be described with the help of IS with q related to the coupling constant J in the context of Kondo model.

Original languageEnglish
Pages (from-to)660-666
Number of pages7
JournalJournal of Low Temperature Physics
Issue number3-4
StatePublished - 1 Feb 2008


  • Heavy fermions
  • Kondo model
  • Nonextensive statistics

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