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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.68: Poster

Thursday, March 17, 2011, 10:00–13:00, P1

Response of Jahn-Teller inhomogeneities to uniaxial strain. — •Joaquin Miranda Mena — German Research School for Simulation Sciences and RWTH Aachen University, 52425 Jülich

Using Monte Carlo simulations we study the effect of uni-axial strain in a two-dimension electron-phonon Hamiltonian with long-range Coulomb interaction. Lattice effects are introduced in form of Jahn-Teller (JT) polarons. In the absence of strain we observe that charge clustering is accompanied with a strong suppression of single particle density of states (DOS) for high doping and low temperatures. Remarkably, these clusters take stripe forms when the JT attraction and the Coulomb repulsion are similar in magnitude. In this work we report how the map of lattice distortions and DOS are modified in the presence of the uniaxial strain. In the case of ferro-distortive JT attraction we observe orbital ordering and no changes of cluster shapes. The presence of the strain is mainly reflected in DOS of unoccupied states. In the case of antiferro-distortive JT attraction, clusters start to melt with increasing strain.