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Mesoscopic phase separation in the model with competing Jahn-Teller and Coulomb Interactions
We have derived the interaction between Jahn-Teller centers due to optical and acoustic phonons. The model leads to global phase separation at low temperatures. At long distances the Coulomb repulsion always dominates leading to phase separation on a short scale. On the basis of the Monte-Carlo simulations of microscopic lattice-gas model we have formulated effective phenomenological model. In the limit of low density of polarons phase separation takes place in the form of charged bubbles. In the limit of high density charge segregation occurs on the domain walls. The relevance of the model to the phase diagram of high-Tc superconductors is discussed. Events
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