Ultraviolet Raman spectroscopy of hexagonal LuFeO$_{3}$ films

ORAL

Abstract

Hexagonal LuFeO$_{3}$ films grown by molecular-beam epitaxy on yttria-stabilized zirconia substrates were studied by variable temperature ultraviolet Raman spectroscopy. Hexagonal LuFeO$_{3}$ is a multiferroic that is isostructural to YMnO$_{3}$ at room temperature. LuFeO$_{3}$ spectra at room temperature are consistent with the polar hexagonal \textit{P6}$_{3}$\textit{cm} structure. The temperature evolution of the Raman spectra of a LuFeO$_{3}$ film measured in the range 10--1250 K indicate a transition to a non-polar (likely \textit{P6}$_{3}$\textit{/mmc}) phase; fitting of the temperature dependence of the Raman intensities yields a transition temperature of 1020 $\pm$ 50 K. We also observed a change in the slope of Raman intensity vs. temperature dependence of the most intense phonon peak around 400-450 K, which might indicate another structural transition, possibly to a structure with space group \textit{P6}$_{3}$\textit{mc} (also polar).

*Supported in part by NSF under grant DMR-1006136.

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Authors

  • Dmitri A. Tenne

    • Boise State University
    • Department of Physics, Boise State University, Boise, ID 83725, USA

  • D.A. Hillsberry

    • Department of Physics, Boise State University, Boise, ID 83725, USA

  • E.L. Thies

    • Department of Physics, Boise State University, Boise, ID 83725, USA

  • J.A. Mundy

    • School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA

  • D.A. Muller

    • School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA

  • C.M. Brooks

    • Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA

  • D.G. Schlom

    • Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA