Quasiparticle states in the antiferromagnetic phase of double exchange systems

Regular Article

Abstract

We present a theory for the quasiparticle band structure in the antiferromagnetic phase of a Kondo-lattice Hamiltonian with ferromagnetic Hund’s rule exchange between conduction electrons and localized spins and antiferromagnetic superexchange between localized spins. The quantum mechanical character of the localized spins is kept and no semiclassical approximation is made. Comparison of the obtained quasiparticle spectrum with exact diagonalization of finite clusters shows good agreement. Ferromagnetic polarization is energetically favorable only for very weak superexchange and small conduction electrons density. We discuss localized states where a conduction electron is trapped near a misalligned localized spin as well as superlattices of such misalligned spins.

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Department of PhysicsChiba UniversityChibaJapan
  2. 2.Karlsruhe Institut of Technology, Institut für FestkörperphysikKarlsruheGermany
  3. 3.Institute for Low Temperature and Structure ResearchWrocław 2Poland

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