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Raman Studies of the Soft Phonon Modes in BaxSr1−x.TiO3 thin Films

Published online by Cambridge University Press:  17 March 2011

D. A. Tenne ,
A. M. Clark ,
A. R. James ,
A. Soukiassian ,
K. Chen  and
X. X. Xi
D. A. Tenne
Affiliation:
Department of Physics, the Pennsylvania State University, University Park, PA 16802, U.S.A
A. M. Clark
Affiliation:
Department of Physics, the Pennsylvania State University, University Park, PA 16802, U.S.A
A. R. James
Affiliation:
Department of Physics, the Pennsylvania State University, University Park, PA 16802, U.S.A
A. Soukiassian
Affiliation:
Department of Physics, the Pennsylvania State University, University Park, PA 16802, U.S.A
K. Chen
Affiliation:
Department of Physics, the Pennsylvania State University, University Park, PA 16802, U.S.A
X. X. Xi
Affiliation:
Department of Physics, the Pennsylvania State University, University Park, PA 16802, U.S.A
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Abstract

The vibrational properties of barium strontium titanate thin films were studied by Raman spectroscopy in the temperature range from 5 to 300 K. The films were grown by pulsed laser deposition on SrTiO3 and LaAlO3 substrates with SrRuO3 buffer layers. Soft phonons are observed in Raman spectra of BaxSr1−xTiO3 films with Ba contents x = 0.05, 0.1, 0.2 and 0.5. The temperature dependence of the soft phonon frequencies and the splitting of the triply degenerated soft mode into two components of A and E symmetries indicate the ferroelectric phase transition. The E soft mode line is overdamped over a broad range of temperatures near the ferroelectric phase transition, while it is clearly seen in the spectra at temperatures away from the phase transition. The relative Raman intensity of the A soft mode and hard modes decreases gradually over a broad range of temperatures. This indicates a broad ferroelectric phase transition in the thin films. Comparison of Raman spectra for films grown on SrTiO3 and LaAlO3 substrates shows the influence of strain on the temperature of the ferroelectric phase transition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 688: Symposium C – Ferroelectric Thin Films X , 2001 , C12.5.1
Copyright
Copyright © Materials Research Society 2002

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