Spectrum and phase transitions in Kondo lattices

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In this paper, I analyze the spectra of composite systems of charged modes and localized spin fields. I determined the structure of the ground state and the excited states based on the coupling of charged modes and spin-fluctuation waves traveling into the spin field. This is carried out considering the interplay of the renormalized Kondo Hamiltonian and the induced Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction. The spectrum of these states is deduced in several cases, when the spin field state is magnetically nonordered and when it is antiferromagnetic. I show that in both spin field states the fluctuation waves can confer a narrow band structure character to these excited states, whose k dispersion is due to the (Formula presented) interaction. In addition, for both spin field states, the Kondo effects compete with the RKKY effects and the concatenation of the two actions can produce different phases. I analyze the conditions for the appearance of such phases and outline some of their properties. © 2000 The American Physical Society.
Original languageEnglish
Pages (from-to)415-424
JournalPhysical Review B - Condensed Matter and Materials Physics
Publication statusPublished - 1 Jan 2000


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