Order from disorder in the double-exchange model

Details Order from disorder in the double-exchange model Order from disorder in the double-exchange model

2000-11-22

arxiv.org/abs/cond-mat/0011390v2

J. Phys. Condens. Matt, 14, L235-241 (2002).

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages latex, 3 eps figures

Scientific paper

10.1088/0953-8984/14/12/101

The magnetic excitations of the double exchange (DE) model are usually discussed in terms of an equivalent ferromagnetic Heisenberg model. However this equivalence is valid only at a quasi--classical level - we show that both quantum and thermal corrections to the magnetic properties of DE model differ from an effective Heisenberg model because its spin excitations interact only indirectly, through the exchange of charge fluctuations. We also find that the competition between ferromagnetic double exchange and an antiferromagnetic superexchange provides a new example of an "order from disorder" phenomenon - an intermediate spin configuration (either a canted or a spiral state) is selected by quantum and/or thermal fluctuations.

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