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Order from disorder in the double-exchange model

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Shannon,  N.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Chubukov,  A. V.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Shannon, N., & Chubukov, A. V. (2002). Order from disorder in the double-exchange model. Journal of Physics-Condensed Matter, 14(12), L235-L241. Retrieved from http://www.iop.org/EJ/abstract/0953-8984/14/12/101.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-37BA-F
Abstract
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 the DE model differ from any effective Heisenberg model because its spin excitations interact only indirectly, through the exchange of charge fluctuations. We also find that the competition between ferromagnetic DE and an anti ferromagnetic 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.