Optical spectroscopy of charge-ordering transition in La1/3Sr2/3FeO3

T. Ishikawa, S. K. Park, Takuro Katsufuji, T. Arima, Y. Tokura

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Abstract

The change of the electronic structure and lattice dynamics upon the charge-ordering (CO) transition has been investigated for a La1/3Sr2/3FeO3 crystal by measurements of optical spectra. The CO transition, as characterized by sequential 2:1 ordering of nominal Fe3+ and Fe5+(111)c sheets at TCO=198 K, activates several additional optical phonon modes due to the charge modulation and opens an optical gap (up to 2Δ∼0.13 eV). The spectral intensity of the activated phonon mode shows a discontinuous increase at TCO reflecting the first-order nature of the CO transition. By contrast, the optical gap value increases rather continuously with decreasing temperature below TCO, implying the effect of the concomitant antiferromagnetic spin ordering on the gap magnitude and structure.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume58
Issue number20
Publication statusPublished - 1998 Nov 15
Externally publishedYes

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Lattice vibrations
Electronic structure
Modulation
Crystals
spectroscopy
Temperature
optical spectrum
electronic structure
modulation
crystals
Optical spectroscopy
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Optical spectroscopy of charge-ordering transition in La1/3Sr2/3FeO3 . / Ishikawa, T.; Park, S. K.; Katsufuji, Takuro; Arima, T.; Tokura, Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 58, No. 20, 15.11.1998.

Research output: Contribution to journalArticle

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