Magnetic Order in the Double Exchange Model in Infinite Dimensions

Abstract

We studied magnetic properties of the double exchange (DE) model with S=1/2 localized spins at T=0, using exact diagonalization in the framework of the dynamical mean field theory. Obtained phase diagram contains ferromagnetic, antiferromagnetic and paramagnetic phases. Comparing the phase diagram with that of the DE model with classical localized spins, we found that the quantum fluctuations of localized spins partly destabilize the ferromagnetism and expand the paramagnetic phase region. We found that phase separations occur between the antiferromagnetic and paramagnetic phases as well as the paramagnetic and ferromagnetic ones.

11 pages, LaTeX, 9 eps-figures

References in corpus (3)

• Phase Separation in Electronic Models for Manganites
• On the Theory of Magnets with Competing Double Exchange and Superexchange Interactions
• Electronic structure and resistivity of the double exchange model

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• Magnetic phase diagram of the Kondo lattice model with quantum localized spins
• Inverse indirect magnetic exchange
• Short-Range Ordered Phase of the Double-Exchange Model in Infinite Dimensions
• Transport properties in Simplified Double Exchange model
• Effective Ruderman-Kittel-Kasuya-Yosida-like interaction in diluted double-exchange model: self-learning Monte Carlo approach
• Magnetic Instabilities and Phase Diagram of the Double-Exchange Model in Infinite Dimensions
• Suppression and revival of long-range ferromagnetic order in the multiorbital Fermi-Hubbard model