Nonlinear Electron-Phonon Coupling in Doped Manganites.

  title={Nonlinear Electron-Phonon Coupling in Doped Manganites.},
  author={Vincent J Esposito and Michael Fechner and Roman Mankowsky and Henrik Till Lemke and Matthieu Chollet and James M. Glownia and M. Nakamura and Masashi Kawasaki and Yoshinori Tokura and Urs Staub and Paul Beaud and Michael F{\"o}rst},
  journal={Physical review letters},
  volume={118 24},
We employ time-resolved resonant x-ray diffraction to study the melting of charge order and the associated insulator-to-metal transition in the doped manganite Pr_{0.5}Ca_{0.5}MnO_{3} after resonant excitation of a high-frequency infrared-active lattice mode. We find that the charge order reduces promptly and highly nonlinearly as function of excitation fluence. Density-functional theory calculations suggest that direct anharmonic coupling between the excited lattice mode and the electronic… 
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