Raman Study of Oxygen Reduced and Re-Oxidized Strontium Titanate

Authors

Dmitri Tenne, Boise State UniversityFollow
I. E. Gonenli, Pennsylvania State University, University Park
A. Soukiassian, Pennsylvania State University, University Park
D. G. Schlom, Pennsylvania State University, University Park
S. M. Nakhmanson, Rutgers University
K. M. Rabe, Rutgers University
X. X. Xi, Pennsylvania State University, University Park

Document Type

Article

Publication Date

2007

Abstract

We report Raman study of oxygen-reduced single crystal strontium titanate. Oxygen reduction leads to the appearance of the forbidden first order Raman peaks, as well as new spectral features attributed to the local vibrational modes associated with oxygen vacancies. This assignment is supported by ab initio calculations of phonon modes in SrTiO₃ with introduced oxygen vacancies. Raman studies of re-oxidized samples show the same spectra as the initial single crystals. Comparison of Raman spectra of SrTiO₃ thin films and reduced SrTiO₃ single crystals demonstrates the importance of other factors such as polar grain boundaries in the lattice dynamical behavior of thin films.

Copyright Statement

This is an author-produced, peer-reviewed version of this article. The final, definitive version of this document can be found online at Physical Review B, published by American Physical Society. Copyright restrictions may apply. DOI: 10.1103/PhysRevB.76.024303

Publication Information

Tenne, Dmitri; Gonenli, I. E.; Soukiassian, A.; Schlom, D. G.; Nakhmanson, S. M.; Rabe, K. M.; and Xi, X. X.. (2007). "Raman Study of Oxygen Reduced and Re-Oxidized Strontium Titanate". Physical Review B, 76(2), . http://dx.doi.org/10.1103/PhysRevB.76.024303