Anomalous Phonon Behavior in Orthorhombic LuMnO3 at Low Temperature

ORAL

Abstract

We present the pressure dependent phonon spectra of orthorhombic-LuMnO3 which are conducted in the low temperature region (below T$_{N}$ and T$_{L})$. A temperature dependent anomalous phonon coincides with the ferroelectric behavior at low pressure condition. At $\sim $10 GPa, this anomalous phonon exhibits an unusual softening trend which will be suppressed at higher pressure. This work is supported by DOE Grant DE-FG02-07ER46402 (NJIT), by DE-FG02-07ER46402 (Rutgers), by COMPRES (U2A beam line at NSLS), the Consortium for Materials Properties Research in Earth Sciences under NSF Cooperative Agreement EAR01-35554, U.S. Department of Energy (DOE-BES and NNSA/CDAC) and by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886 (use of NSLS at Brookhaven National Laboratory).

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Authors

  • Peng Gao

    • Department of Physics, New Jersey Institute of Technology, Newark, NJ 07102

  • Haiyan Chen

    • Department of Physics, New Jersey Institute of Technology, Newark, NJ 07102

  • Trevor A. Tyson

    • Department of Physics, New Jersey Institute of Technology, Newark, NJ 07102

  • Zhenxian Liu

    • Geophysical Laboratory, Carnegie Institution of Washington DC 20015

  • Jianming Bai

    • Oak RidgOak Ridge National Laboratory Oak Ridge, TN 37831

  • Liping Wang

    • Mineral Physics Institute, Stony Brook University, Stony Brook, NY 11794

  • YoungJai Choi

    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854

  • Sang-Wook Cheong

    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854