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TT: Tiefe Temperaturen

TT 13: Correlated Electrons: Metal Insulator Transition - Part 1

TT 13.5: Talk

Tuesday, March 28, 2006, 12:45–13:00, HSZ 105

DMFT calculations for manganites with electron-phonon Interaction — •Yi-feng Yang and Karsten Held — Max-Planck-Institute for Solid State Research, 70569 Stuttgart, Germany

The metal-insulator transition in manganites such as La_1−xCa_xMnO₃ has attracted much interest in recent years, but the mechanism is still not fully understood. There has been a debate whether the local Coulomb interaction or the electron-phonon interaction is more important. We present here the first dynamical mean field theory calculation for two e_g bands, taking into account both interactions, as well as the Hund coupling to the local t_2g electrons. For undoped system, our results show that both Coulomb and electron-phonon interaction are necessary to describe LaMnO₃. We also show spectra for doped manganites.