Nonlinear Electron-Phonon Coupling in Doped Manganites

V. Esposito, M. Fechner, R. Mankowsky, H. Lemke, M. Chollet, J. M. Glownia, M. Nakamura, M. Kawasaki, Y. Tokura, U. Staub, P. Beaud, and M. Först
Phys. Rev. Lett. 118, 247601 – Published 15 June 2017
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Abstract

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 Pr0.5Ca0.5MnO3 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 structure drives these dynamics, highlighting a new avenue of nonlinear phonon control.

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  • Received 20 December 2016

DOI:https://doi.org/10.1103/PhysRevLett.118.247601

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

V. Esposito1,*, M. Fechner2,3, R. Mankowsky2,4, H. Lemke5,6, M. Chollet5, J. M. Glownia5, M. Nakamura7, M. Kawasaki7,8, Y. Tokura7,8, U. Staub1, P. Beaud1,6,‡, and M. Först2,4,†

  • 1Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
  • 2Max-Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany
  • 3Materials Theory, ETH Zürich, Wolfgang-Pauli-Strasse 27, 8093 Zürich, Switzerland
  • 4Center for Free Electron Laser Science, 22761 Hamburg, Germany
  • 5LCLS, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 6SwissFEL, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
  • 7RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan
  • 8Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan

  • *vincent.esposito@psi.ch
  • michael.foerst@mpsd.mpg.de
  • paul.beaud@psi.ch

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Issue

Vol. 118, Iss. 24 — 16 June 2017

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