Dielectric and lattice dynamical properties of SrTiO3 thin films

X. X. Xi, A. A. Sirenko, I. A. Akimov, A. M. Clark, J. H. Hao, Weidong Si

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Pulsed-laser-dcposited SrTiO3 thin films are used as all example to illustrate the effects of strain, oxygen vacancies, and interfacial dead layer on the dielectric and lattice dynamical properties in ferroelectric thin films. We found that strain, both lattice mismatch-induced and due to local defects such as oxygen vacancies, dramatically influences the properties of the thin films. The cubic-to-tetragonal structural phase transition is greatly modified by the strain in the films. Raman scattering shows the symmetry-forbidden optical phonons, indicating the reduction of symmetry. The line shape of the polar phonon shows a Fano asymmetry, which we suggest to be due to the micro polar regions or other local polar structures around the oxygen vacancies. The temperature dependence of the low-frequency complex dielectric constant shows markedly distinct quantum fluctuation behaviors from those of the single crystals. The soft mode is considerably hardened in the thin films compared to the single crystals.

Original languageEnglish (US)
Pages (from-to)247-256
Number of pages10
JournalIntegrated Ferroelectrics
Volume28
Issue number1-4
DOIs
StatePublished - 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Control and Systems Engineering
  • Ceramics and Composites
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

Keywords

  • Dielectric loss
  • Lattice dynamics
  • Strontium titanate

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