Magnetic Order in the Double Exchange Model in Infinite Dimensions

Details Magnetic Order in the Double Exchange Model in Infinite Dimensions Magnetic Order in the Double Exchange Model in Infinite Dimensions

1999-11-05

arxiv.org/abs/cond-mat/9911091v2

J. Phys. Soc. Jpn. 69, 1837 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, LaTeX, 9 eps-figures

Scientific paper

10.1143/JPSJ.69.1837

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.

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