Multi-spin-state dynamics during insulator-metal crossover in LaCoO3

A. Doi, J. Fujioka, T. Fukuda, S. Tsutsui, D. Okuyama, Y. Taguchi, T. Arima, A. Q.R. Baron, Y. Tokura

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

We have investigated the dynamics of spin-state crossover (SSC) for perovskite LaCoO3 through optical phonons by means of infrared and inelastic x-ray spectroscopy. Upon thermally induced SSC, anomalously dispersionless Co-O bond stretching phonons coupled to the thermally excited spin state have been identified. The enhanced spin-state fluctuation irrespective of the presence of a clear charge gap suggests the emergence of complex spin-state disproportionation involving low-, intermediate-, and high-spin states due to the strong correlation among thermally activated spin states.

Original languageEnglish
Article number081109
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number8
DOIs
Publication statusPublished - 2014 Aug 18
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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