Kondo Lattice Models for Rare-Earth and Actinide Systems

• Authors: B. Coqblin
• Languages of publication: EN

Abstracts

EN

We present here some works on the strong competition between the Kondo effect, magnetic order and eventually spin glass or frustration effect in anomalous rare-earth and actinide systems. First, we develop an underscreened Kondo lattice model with S_{f} = 1 spins for the 5f-electrons and we have recently improved it by deriving, by the Schrieffer-Wolff transformation, a 5f-band with a finite bandwidth. The underscreened Kondo lattice model can account for properties of some uranium and neptunium compounds, like UTe, Np_2PdGa_3 or UCu_2Si_2 which have a large Curie temperature T_{c} of order 100 K and present also a Kondo behavior. In particular, we can account for the observed maximum of T_{c} under pressure in UTe and the magnetization curves of NpNiSi_2 showing the occurrence of the Kondo effect at low temperatures below T_{c}. Second, we have studied the properties of disordered cerium alloys like CeCu_xNi_{1-x} or CeRh_xPd_{1-x} by considering the Kondo effect, a ferromagnetic order and a spin glass behavior described by several approaches. The van Hemmen approach gives a good explanation of the properties of cerium alloys and we are describing the magnetic glass clusters which occur in both spin glass and ferromagnetic phases. Third, we present a new description of a frustrated Kondo lattice model, which can account for the behavior under pressure or doping of some ytterbium compounds like Yb_2Pd_2Sn and YbAgGe.

Keywords

EN

71.27.+a; 75.10.Nr; 75.30.Nr

Discipline

• 75.10.Nr: Spin-glass and other random models(for spin glasses and other random magnets, see 75.50.Lk)
• 71.27.+a: Strongly correlated electron systems; heavy fermions

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 5-6
• Pages: 1005-1013

Dates

published

2012-05

Contributors

author

B. Coqblin

• Laboratoire de Physique des Solides, UMR 8502, CNRS - Université Paris-Sud, 91405-Orsay, France

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Identifiers

DOI

10.12693/APhysPolA.121.1005