Heavy-fermion and spin-liquid behavior in a Kondo lattice with magnetic frustration

Details Heavy-fermion and spin-liquid behavior in a Kondo lattice with magnetic frustration Heavy-fermion and spin-liquid behavior in a Kondo lattice with magnetic frustration

2001-07-13

arxiv.org/abs/cond-mat/0107288v2

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 1 figure. Latex

Scientific paper

10.1103/PhysRevB.66.045111

We study the competition between the Kondo effect and frustrating exchange interactions in a Kondo-lattice model within a large-${\cal N}$ dynamical mean-field theory. We find a T=0 phase transition between a heavy Fermi-liquid and a spin-liquid for a critical value of the exchange $J_c = T_{K}^0$, the single-impurity Kondo temperature. Close to the critical point, the Fermi liquid coherence scale $T^\star$ is strongly reduced and the effective mass strongly enhanced. The regime $T>T^\star$ is characterized by spin-liquid magnetic correlations and non-Fermi-liquid properties. It is suggested that magnetic frustration is a general mechanism which is essential to explain the large effective mass of some metallic compounds such as LiV$_2$O$_4$.

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