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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2011

Frustration in the Kondo lattice model: Local versus extended singlet phases

Résumé

We present a theoretical study of the frustrated Kondo lattice model on a Shastry-Sutherland-type lattice. Using a mean-field decoupling on both the Kondo and intersite exchange interactions, we study three different phases, an antiferromagnetic (AF) phase without Kondo effect, a Kondo (K) phase without magnetic order, and finally a valence bond solid (VBS) phase without magnetic order and Kondo effect. A phase diagram is obtained giving the stability region of the three phases, as a function of the Kondo parameter JK and the frustration ratio J/J' of the two exchange interactions on the Shastry-Sutherland lattice. This phase diagram can account for the change under pressure from a nonmagnetic Kondo phase to an AF phase and to a completely different nonmagnetic VBS phase occurring in some ytterbium compounds such as Yb2Pd2Sn.
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Dates et versions

hal-00844805 , version 1 (15-07-2013)

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B. H. Bernhard, B. Coqblin, Claudine Lacroix. Frustration in the Kondo lattice model: Local versus extended singlet phases. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011, 83, pp.214427. ⟨10.1103/PHYSREVB.83.214427⟩. ⟨hal-00844805⟩
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