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Magnetism and Kondo effect in strongly correlated electron systems

B. COQBLIN1,* , J. R. IGLESIAS2, S. G. MAGALHAES3, N. B. PERKINS4,5, F. M. ZIMMER3

Affiliation

  1. Laboratoire de Physique des Solides, Université Paris-Sud, UMR-8502 CNRS, 91405 Orsay, France
  2. Instituto de Física, Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre, Brazil
  3. Laboratorio de Mecanica Estatistica e Teoria da Materia Condensada, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
  4. Institute fur Theoretische Physik, TU Braunschweig, Mendelssohnstrasse 3, 38106 Braunschweig, Germany
  5. Bogoliubov Laboratory of Theoretical Physics, JINR, Dubna, Russia

Abstract

We present here a review on three important problems of the Kondo lattice theory. First, the normal Kondo lattice effect has been extensively studied and accounts for many properties of cerium or ytterbium systems. Then, we present here a new theoretical study of the underscreened Kondo lattice problem, which can well account for the ferromagnetic - Kondo coexistence observed in some uranium compounds such as UTe. Finally, we discuss the spin glass-Kondo competition and the resulting phase diagrams showing spin glass, Kondo and magnetically ordered phases observed in disordered heavy fermion cerium alloys such as CeCuxNi1-x alloys..

Keywords

Kondo-effect, Strongly correlated electron systems, UTe, CeCuxNi1-x alloys.

Submitted at: April 1, 2008
Accepted at: July 1, 2008

Citation

B. COQBLIN, J. R. IGLESIAS, S. G. MAGALHAES, N. B. PERKINS, F. M. ZIMMER, Magnetism and Kondo effect in strongly correlated electron systems, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 7, pp. 1583-1594 (2008)