2005/09/10 by Chungwei Lin, chungwei Lin, Andrew J. Millis +1
Computer Science · Mathematics · Physics and Astronomy · #Amplitude #Computer science #Instability #Mathematics #Mean field theory #Nonlinear Dynamics and Pattern Formation #Parameter space #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Quantum electrodynamics #Quantum mechanics #Space (punctuation) #Statistical physics #Statistics #Theoretical and Computational Physics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.72.245112
5 pages 5 figures
arxiv created 2005/09/10 · openalex publication_date 2005/12/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.