Phonon Anomaly across Charge/Orbital Ordering Transition in Pr$_{0.65}$Ca$_{0.35}$MnO$_{3}$.

ORAL

Abstract

The lattice dynamics, especially the Jahn-Teller active optical phonon modes across the charge/orbital ordering (CO/OO) transition in the single crystal Pr$_{0.65}$Ca$_{0.35}$MnO$_{3}$ has been investigated using inelastic neutron scattering (INS) technique. Three phonon peaks (around 36, 58 and 74 meV near the Brillouin zone center) appear in the scattering spectra, which are associated with the bond-stretching and bond-breathing modes of MnO$_{6}$. Both intensity and phonon energies show changes when the system undergoes the CO/OO transition indicating a strong coupling between the lattice and orbital degrees of freedom.

*Supported by DOE DE-FG02-04ER46125. NSF DMR-0346826 and DMR-0453804

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Authors

  • Jiandi Zhang

    • Department of Physics, Florida International University, Miami, FL 33199
    • Florida International University, Miami, FL 33199
    • Florida International University
    • Florida International University (FIU), Miami, FL 33199

  • Hao Sha

    • Department of Physics, Florida International University, Miami, FL 33199
    • Florida International University, Miami, FL 33199

  • Feng Ye

    • Oak Ridge National Laboratory, Oak Ridge, TN 37831
    • Oak Ridge National Laboratory
    • ORNL

  • Mark Lumsden

    • Oak Ridge National Laboratory, Oak Ridge, TN 37831
    • Oak Ridge National Laboratory, Oak Ridge TN 37831
    • Neutron Scattering Science Division, Oak Ridge National Laboratory

  • Pengcheng Dai

    • University of Tennessee, Knoxville, TN 37996;Oak Ridge National Laboratory, Oak Ridge, TN 37831
    • University of Tennessee, Knoxville
    • Department of Physics, University of Tennessee, Oak Ridge National Lab

  • J. A. Fernandez-Baca

    • University of Tennessee, Knoxville, TN 37996;Oak Ridge National Laboratory, Oak Ridge, TN 37831
    • Oak Ridge National Laboratory

  • Y. Tomioka

    • Correlated Electron Research Center, Tsukuba 305-0046, Japan

  • Yoshinori Tokura

    • University of Tokyo, Tokyo 113-8656, Japan
    • Correlated Electron Research Center, Tsukuba 305-0046, Japan;University of Tokyo, Tokyo 113-8656, Japan
    • University of Tokyo, Japan
    • Department of Applied Physics, University of Tokyo