Raman study of oxygen reduced and re-oxidized strontium titanate

D. A. Tenne, I. E. Gonenli, A. Soukiassian, D. G. Schlom, S. M. Nakhmanson, K. M. Rabe, and X. X. Xi

Phys. Rev. B 76, 024303 – Published 9 July 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 spectral features attributed to the local vibrational modes associated with oxygen vacancies. This assignment is supported by ab initio calculations of phonon modes in $Sr Ti O_{3}$ with introduced oxygen vacancies. Raman studies of re-oxidized samples show the same spectra as the initial single crystals. Comparison of Raman spectra of $Sr Ti O_{3}$ thin films and reduced $Sr Ti O_{3}$ single crystals demonstrates the importance of other factors such as polar grain boundaries in the lattice dynamical behavior of thin films.

Received 4 March 2007

DOI:https://doi.org/10.1103/PhysRevB.76.024303

Authors & Affiliations

D. A. Tenne^*

Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA and Department of Physics, Boise State University, Boise, Idaho 83725-1570, USA

I. E. Gonenli, A. Soukiassian, and D. G. Schlom

Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA

S. M. Nakhmanson^† and K. M. Rabe

Department of Physics and Astronomy, Rutgers, State University of New Jersey, Piscataway, New Jersey 08854–8019, USA

X. X. Xi

Department of Physics, Department of Materials Science and Engineering, and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA

^*Electronic address: dmitritenne@boisestate.edu
^†Present address: Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA.

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Vol. 76, Iss. 2 — 1 July 2007

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