Origin of the non-linear pressure effects in perovskite manganites: Buckling of MnOMn bonds and JahnTeller distortion of the MnO6 octahedra induced by pressure

Z. Chen, T. A. Tyson, K. H. Ahn, Z. Zhong, J. Hu

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

High-pressure resistivity and X-ray diffraction measurements were conducted on La0.85MnO3-δ at ∼6 and ∼7 GPa, respectively. At low pressures the metalinsulator transition temperature (T MI) increases linearly up to a critical pressure, P (*) ∼3.4 GPa, followed by reduction in TMI at higher pressure. Analysis of the bond distances and bond angles reveals that a bandwidth increase drives the increase in TMI below P (*). The reduction in TMI at higher pressures is found to result from JahnTeller distortions of the MnO6 octahedra. The role of anharmonic interatomic potentials is discussed.

Original languageEnglish (US)
Pages (from-to)3049-3052
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume322
Issue number20
DOIs
StatePublished - Oct 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Keywords

  • High pressure
  • Metalinsulator transition
  • Perovskite manganite

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