Pressure dependent structural changes and predicted electrical polarization in perovskite RMnO3

T. Wu, H. Chen, P. Gao, T. Yu, Z. Chen, Z. Liu, K. H. Ahn, X. Wang, S. W. Cheong, T. A. Tyson

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

High pressure x-ray diffraction measurements on perovskite RMnO3 (R = Dy, Ho and Lu) reveal that varying structural changes occur for different R ions. Large lattice changes (orthorhombic strain) occur in DyMnO3 and HoMnO3 while the Jahn-Teller (JT) distortion remains stable. Conversely, in the small R-ion system LuMnO3, Mn-O bond distortions are observed between 4 and 8 GPa with a broad minimum in the JT distortion. High pressure infrared measurements indicate that a phonon near 390 cm-1 corresponding to the complex motion of the Mn and O ions changes anomalously for LuMnO3. It softens in the 4-8 GPa region, which is consistent with the structural change in Mn-O bonds and then hardens at higher pressures. By contrast, the phonons continuously harden with increasing pressure for DyMnO3 and HoMnO3. Density functional theory methods show that E-phase LuMnO3 is the most stable phase up to the 10 GPa pressure examined. Simulations indicate that the distinct structural change under pressure in LuMnO3 can possibly be used to optimize the electric polarization by pressure/strain.

Original languageEnglish (US)
Article number056005
JournalJournal of Physics Condensed Matter
Volume28
Issue number5
DOIs
StatePublished - Jan 13 2016

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • E-phase
  • ferroelectric
  • multiferroic
  • pressure
  • structure

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