Soft phonon modes in Ba0.5Sr0.5TiO3 thin films studied by Raman spectroscopy

D. A. Tenne; A. M. Clark; A. R. James; K. Chen; X. X. Xi

doi:10.1063/1.1424463

Soft phonon modes in Ba_0.5Sr_0.5TiO₃ thin films studied by Raman spectroscopy

D. A. Tenne, A. M. Clark, A. R. James, K. Chen, X. X. Xi

Physics Department

Pennsylvania State University

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

We have studied vibrational properties of Ba_0.5Sr_0.5TiO₃ thin films grown by pulsed laser deposition on SrTiO₃ and LaAlO₃ substrates with SrRuO₃ buffer layers by Raman spectroscopy over the temperature range from 5 to 300 K. The soft phonon modes were observed. The temperature dependence of the soft phonon frequency 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 is overdamped over a broad range of temperatures, and the A soft mode intensity decreases gradually in this range. This indicates a broad ferroelectric phase transition in the thin films. A comparison of results obtained from films deposited on SrTiO₃ and LaAlO₃ substrates shows that strain shifts the ferroelectric phase transition temperatures.

Original language	English
Pages (from-to)	3836-3838
Number of pages	3
Journal	Applied Physics Letters
Volume	79
Issue number	23
DOIs	https://doi.org/10.1063/1.1424463
State	Published - 3 Dec 2001

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abstract = "We have studied vibrational properties of Ba0.5Sr0.5TiO3 thin films grown by pulsed laser deposition on SrTiO3 and LaAlO3 substrates with SrRuO3 buffer layers by Raman spectroscopy over the temperature range from 5 to 300 K. The soft phonon modes were observed. The temperature dependence of the soft phonon frequency 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 is overdamped over a broad range of temperatures, and the A soft mode intensity decreases gradually in this range. This indicates a broad ferroelectric phase transition in the thin films. A comparison of results obtained from films deposited on SrTiO3 and LaAlO3 substrates shows that strain shifts the ferroelectric phase transition temperatures.",

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T1 - Soft phonon modes in Ba0.5Sr0.5TiO3 thin films studied by Raman spectroscopy

AU - Tenne, D. A.

AU - Clark, A. M.

AU - James, A. R.

AU - Chen, K.

AU - Xi, X. X.

PY - 2001/12/3

Y1 - 2001/12/3

N2 - We have studied vibrational properties of Ba0.5Sr0.5TiO3 thin films grown by pulsed laser deposition on SrTiO3 and LaAlO3 substrates with SrRuO3 buffer layers by Raman spectroscopy over the temperature range from 5 to 300 K. The soft phonon modes were observed. The temperature dependence of the soft phonon frequency 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 is overdamped over a broad range of temperatures, and the A soft mode intensity decreases gradually in this range. This indicates a broad ferroelectric phase transition in the thin films. A comparison of results obtained from films deposited on SrTiO3 and LaAlO3 substrates shows that strain shifts the ferroelectric phase transition temperatures.

AB - We have studied vibrational properties of Ba0.5Sr0.5TiO3 thin films grown by pulsed laser deposition on SrTiO3 and LaAlO3 substrates with SrRuO3 buffer layers by Raman spectroscopy over the temperature range from 5 to 300 K. The soft phonon modes were observed. The temperature dependence of the soft phonon frequency 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 is overdamped over a broad range of temperatures, and the A soft mode intensity decreases gradually in this range. This indicates a broad ferroelectric phase transition in the thin films. A comparison of results obtained from films deposited on SrTiO3 and LaAlO3 substrates shows that strain shifts the ferroelectric phase transition temperatures.

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Soft phonon modes in Ba_0.5Sr_0.5TiO₃ thin films studied by Raman spectroscopy

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