Ferroelectricity in artificial bicolor oxide superlattices

Sung Seok A. Seo, Jun Hee Lee, Ho Nyung Lee, Matthew F. Chisholm, Woo Seok Choi, Dong Jik Kim, Ji Young Jo, Hanchul Kim, Jaejun Yu, Tae Won Noh

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The ferroelectric growth and properties of high-quality artificial bicolor oxide superlattices composed of two perovskites were analyzed. The bicolor superlattice were grown on a single-crystalline substrates by using pulsed laser deposition after growing conducting films as a bottom electrodes on a single-stepped TiO2-terminated SrTiO3(STO) substrates. The ferroelectric hysterisis loops are found to be affected by the leakage current or the trapped charges at interfaces while ionic displacements in the fully relaxed structure break the inversion symmetry and yield a new polarization in each unit cell. The superlattice shows a potential-energy surface with a single minimum at zero polarization while the ionic motions in ferroelectrics break the inversion symmetry and provide the net dipole moments for displacive ferroelectrics.

Original languageEnglish
Pages (from-to)2460-2464
Number of pages5
JournalAdvanced Materials
Volume19
Issue number18
DOIs
StatePublished - Sep 17 2007

ASJC Scopus subject areas

  • Materials Science (all)
  • Mechanics of Materials
  • Mechanical Engineering

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