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Double-exchange ferromagnetism in the partially-filled one-dimensional Kondo lattice model
Authors:Graeme Honner  Miklós Gulácsi
Institution:119. Department of Theoretical Physics, Institute of Advanced Studies, The Australian National University, Canberra, ACT, 0200, Australia
Abstract:We investigate the incompletely saturated ferromagnetic phase which occurs at strong-coupling in the partially-filled one-dimensional (1D) Kondo lattice model. The double-exchange interaction responsible for the ferromagnetic ordering is absent in dilute Kondo systems, and is a missing element in nearly all theoretical treatments of the model. We discuss how: 1) double-exchange arises in the system, even though the Kondo coupling is antiferromagnetic, and show that at strong-coupling it favors an alignment of the spins of unpaired localized moments; and 2) how this determines the ground-state phase diagram, and properties of the localized moments.
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