Underscreened Kondo lattice model at finite temperature

B. Coqblin, J. R. Iglesias, M. D. Núñez-Regueiro, N. B. Perkins

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We have developed an underscreened Kondo lattice model with an intra-site Kondo exchange interaction JK between the conduction band and localized 5f electrons-described by S = 1 spins in the f2 configuration-and an inter-site ferromagnetic exchange f-f interaction JH. Using a fermionic representation for the spin operators and a mean-field approximation we obtain, from T = 0 up to a critical temperature, a Kondo-ferromagnetic coexistence. This is in agreement with the experimental situation of some Uranium compounds, such as UTe or UCu0.9 Sb2, which order ferromagnetically with a Curie temperature of order 100 K and present also a Kondo behavior. The Curie and Kondo temperatures are also determined.

Original languageEnglish (US)
Pages (from-to)428-430
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Issue number2 SUPPL. PART 1
StatePublished - Mar 2007

Bibliographical note

Funding Information:
This work was partially supported by Brazilian agencies CNPq and FAPERGS through PRONEX 04/0874.9. JRI thanks the hospitality of LPS, Orsay, France, and MPIPKS, Dresden, Germany, and NBP thanks FAPERGS for support during her stay at IF-UFRGS, Porto Alegre, Brazil.


  • Kondo lattice
  • Underscreened Kondo model
  • Uranium compounds


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