Local structure of a trapped photoexcited state of a Fe-Co cyanide studied by x-ray-absorption fine-structure spectroscopy

Toshihiko Yokoyama, Manabu Kiguchi, Toshiaki Ohta, Osamu Sato, Yasuaki Einaga, Kazuhito Hashimoto

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

The local structure of a trapped photoexcited state of a Fe-Co cyanide magnetic material, Na0.4Co1.3Fe(CN)6·5H2O, was investigated by Fe and Co K-edge x-ray-absorption fine-structure spectroscopy. The excited state was prepared by visible-light irradiation at 36 K. In order to obtain detailed structural information, temperature dependence of the local structure was also studied without light irradiation. The Fe-C distance shows almost no change by light irradiation (1.92 Å before and after irradiation), while the average Co-N/O distance is noticeably elongated (1.94 and 2.08 Å before and after irradiation, respectively). This phase transformation is caused by the charge transfer from the FeII(S=0)-CN-CoIII(S=0) configuration to FeIII(S=1/2)-CN-CoII(S=3/2). The local structure of the trapped photoexcited state was found to be identical with that of the high-temperature phase, although the high-temperature phase was created much more effectively by light irradiation than thermal activation.

Original languageEnglish
Pages (from-to)9340-9346
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number13
DOIs
Publication statusPublished - 1999 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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