Suppression of Jahn-Teller distortion and insulator-to-metal transition in LaMnO3 at high pressures

I. Loa*, P. Adler, A. Grzechnik, K. Syassen, U. Schwarz, M. Hanfland, G. Kh Rozenberg, P. Gorodetsky, M. P. Pasternak

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Structural, vibrational and electronic properties of LaMnO3 under pressures up to 38 GPa have been studied by synchrotron X-ray powder diffraction, Raman spectroscopy, optical reflectivity, and transport measurements. The cooperative Jahn-Teller distortion of the MnO6 octahedra of the perovskite-type structure is continuously suppressed with increasing pressure, a process which appears completed at ∼20 GPa. The system remains insulating to 32 GPa, where an insulator-metal transition is observed. This transition is attributed to strengthened Mn-O-Mn interactions due to the increasing overlap of atomic orbitals.

Original languageEnglish
Pages (from-to)325-329
Number of pages5
JournalHigh Pressure Research
Volume22
Issue number2
DOIs
StatePublished - May 2002

Keywords

  • High pressure
  • Insulator-metal-transition
  • Jan-Teller effect
  • LaMnO
  • Phase transition
  • X-ray diffraction

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