Correlated oxygen displacements and phonon mode changes in LaCoO3 single crystal

V. V. Sikolenko, S. L. Molodtsov, M. Izquierdo, I. O. Troyanchuk, D. Karpinsky, S. I. Tiutiunnikov, E. Efimova, D. Prabhakaran, D. Novoselov, V. Efimov

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

X-ray diffraction and inelastic X-ray scattering studies have been performed across the spin (~100 K) and semiconductor-metal (~500 K) transitions in LaCoO3 single crystals. The quadratic increase with temperature of the oxygen displacement parameters parallel and perpendicular to the Co-O bond has been correlated with softening of the TO2 and hardening of the TO1 phonon branches along the [0 ξ ξ] high symmetry direction. The latter effect can be associated with the weakening of the Co-O bond strength derived from the increase of Co-O bond length and angle as expected upon increasing the high spin state population of the system with temperature.

Original languageEnglish
Pages (from-to)597-599
Number of pages3
JournalPhysica B: Condensed Matter
Volume536
DOIs
Publication statusPublished - 1 May 2018
Externally publishedYes

Keywords

  • Inelastic X-ray scattering
  • Spin state
  • X-ray diffraction

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