Absence of significant structural changes near the magnetic ordering temperature in small-ion rare earth perovskite RMnO3

T. Yu, T. A. Tyson, H. Y. Chen, A. M.M. Abeykoon, Y. S. Chen, K. H. Ahn

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Detailed structural measurements on multiple length scales were conducted on a new perovskite phase of ScMnO3, and on orthorhombic LuMnO3 as a benchmark. Complementary density functional theory (DFT) calculations were carried out, and predict that ScMnO3 possesses E-phase magnetic order at low temperature with displacements of the Mn sites (relative to the high temperature state) of ∼0.07Å, compared to ∼0.04Å predicted for LuMnO3. However, detailed local, intermediate and long-range structural measurements by x-ray pair distribution function analysis, single crystal x-ray diffraction and x-ray absorption spectroscopy, find no local or long-range distortions on crossing into the low temperature E-phase of the magnetically ordered state. The measurements place upper limits on any structural changes to be at most one order of magnitude lower than DFT predictions and suggest that this theoretical approach does not properly account for the spin-lattice coupling in these oxides and may possibly predict the incorrect magnetic order at low temperatures. The results suggest that the electronic contribution to the electrical polarization dominates and should be more accurately treated in theoretical models.

Original languageEnglish (US)
Article number495402
JournalJournal of Physics Condensed Matter
Volume26
Issue number49
DOIs
StatePublished - Dec 10 2014

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • atomic structure
  • magnetoelectric effects
  • magnetomechanical effects
  • magnetostriction
  • multiferroics

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