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

Abstract

We study the competition between the Kondo effect and frustrating exchange interactions in a Kondo-lattice model within a large-$\mathcal{N}$ 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${}_4$.

7 pages, 1 figure. Latex

References in corpus (2)

• Spin fluctuations in a magnetically frustrated metal, LiV2O4
• Dynamical Mean-Field Theory of Resonating Valence Bond Antiferromagnets

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