Observation of the first-order raman scattering in SrTiO3 thin films

A. A. Sirenko; I. A. Akimov; J. R. Fox; A. M. Clark; Hong Cheng Li; Weidong Si; X. X. Xi

doi:10.1103/PhysRevLett.82.4500

Observation of the first-order raman scattering in Sr_TiO₃ thin films

A. A. Sirenko, I. A. Akimov, J. R. Fox, A. M. Clark, Hong Cheng Li, Weidong Si, X. X. Xi

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172 Scopus citations

Abstract

We have studied lattice dynamic properties of Sr_TiO₃ thin films from 5 to 300 K using metal-oxide bilayer Raman scattering. First-order zone-center optical phonons, symmetry forbidden in single crystals, have been observed in the thin films, indicating strain-induced lowering of symmetry. The asymmetric line shape of the TO₂ phonon is interpreted as evidence for micropolar regions in the thin films, likely due to oxygen vacancies. The optical phonon lines and the asymmetry persist up to room temperature.

Original language	English (US)
Pages (from-to)	4500-4503
Number of pages	4
Journal	Physical Review Letters
Volume	82
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevLett.82.4500
State	Published - 1999
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.82.4500

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title = "Observation of the first-order raman scattering in SrTiO3 thin films",

abstract = "We have studied lattice dynamic properties of SrTiO3 thin films from 5 to 300 K using metal-oxide bilayer Raman scattering. First-order zone-center optical phonons, symmetry forbidden in single crystals, have been observed in the thin films, indicating strain-induced lowering of symmetry. The asymmetric line shape of the TO2 phonon is interpreted as evidence for micropolar regions in the thin films, likely due to oxygen vacancies. The optical phonon lines and the asymmetry persist up to room temperature.",

author = "Sirenko, {A. A.} and Akimov, {I. A.} and Fox, {J. R.} and Clark, {A. M.} and Li, {Hong Cheng} and Weidong Si and Xi, {X. X.}",

year = "1999",

doi = "10.1103/PhysRevLett.82.4500",

language = "English (US)",

volume = "82",

pages = "4500--4503",

journal = "Physical Review Letters",

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T1 - Observation of the first-order raman scattering in SrTiO3 thin films

AU - Sirenko, A. A.

AU - Akimov, I. A.

AU - Fox, J. R.

AU - Clark, A. M.

AU - Li, Hong Cheng

AU - Si, Weidong

AU - Xi, X. X.

PY - 1999

Y1 - 1999

N2 - We have studied lattice dynamic properties of SrTiO3 thin films from 5 to 300 K using metal-oxide bilayer Raman scattering. First-order zone-center optical phonons, symmetry forbidden in single crystals, have been observed in the thin films, indicating strain-induced lowering of symmetry. The asymmetric line shape of the TO2 phonon is interpreted as evidence for micropolar regions in the thin films, likely due to oxygen vacancies. The optical phonon lines and the asymmetry persist up to room temperature.

AB - We have studied lattice dynamic properties of SrTiO3 thin films from 5 to 300 K using metal-oxide bilayer Raman scattering. First-order zone-center optical phonons, symmetry forbidden in single crystals, have been observed in the thin films, indicating strain-induced lowering of symmetry. The asymmetric line shape of the TO2 phonon is interpreted as evidence for micropolar regions in the thin films, likely due to oxygen vacancies. The optical phonon lines and the asymmetry persist up to room temperature.

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DO - 10.1103/PhysRevLett.82.4500

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JO - Physical Review Letters

JF - Physical Review Letters

IS - 22

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Observation of the first-order raman scattering in Sr_TiO₃ thin films

Abstract

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