Magnetic properties of a Kondo insulator with RKKY interaction: Extended dynamical mean field study

Abstract

We study the Kondo lattice model with the Heisenberg-type RKKY-exchange coupling among localized f-spins in the presence of a magnetic field. By means of an extended dynamical mean field theory combined with the non-crossing approximation, we investigate the one-particle spectral function and the dynamical spin correlation function in the Kondo insulating phase. It is shown that the magnetic field and the RKKY exchange interaction both cause the instability to the antiferromagnetic order with enhanced transverse spin fluctuations, which give rise to a strong renormalization of quasi-particles as the system approaches the quantum critical point. This leads to a tendency to retain the Kondo insulating gap up to rather large fields.

11 pages, 10 figures. submitted to Journal of Physics: Condensed Matter

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Cited by in corpus (3)

• Coherence and metamagnetism in the two-dimensional Kondo lattice model
• Large and Small Fermi-Surface Spin Density Waves in the Kondo Lattice Model
• Spectral functions of 2D systems with coupling of electrons to collective or localized spin degrees of freedom