Magnetic Order in the Double Exchange Model in Infinite Dimensions
Kentaro Nagai (1), Tsutomu Momoi (1,2), and Kenn Kubo (3) ((1), University of Tsukuba, (2) Harvard University, (3) Aoyama Gakuin University)
TL;DR
This study investigates the magnetic phases of the quantum double exchange model at zero temperature using dynamical mean field theory, revealing quantum effects that destabilize ferromagnetism and induce phase separation.
Contribution
It provides a detailed phase diagram for the quantum double exchange model, highlighting the impact of quantum fluctuations on magnetic order and phase stability.
Findings
Quantum fluctuations destabilize ferromagnetism.
Phase separation occurs between magnetic phases.
Quantum effects expand the paramagnetic region.
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.
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