Implications of the Low-Temperature Instability of Dynamical Mean Theory for Double Exchange Systems

Details Implications of the Low-Temperature Instability of Dynamical Mean Theory for Double Exchange Systems Implications of the Low-Temperature Instability of Dynamical Mean Theory for Double Exchange Systems

2005-08-31

arxiv.org/abs/cond-mat/0509004v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages 5 figures

Scientific paper

10.1103/PhysRevB.72.245112

The single-site dynamical mean field theory approximation to the double exchange model is found to exhibit a previously unnoticed instability, in which a well-defined ground state which is stable against small perturbations is found to be unstable to large-amplitude but purely local fluctuations. The instability is shown to arise either from phase separation or, in a narrow parameter regime, from the presence of a competing phase. The instability is therefore suggested as a computationally inexpensive means of locating regimes of parameter space in which phase separation occurs.

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