Mossbauer Study of Single Crystal Bi_2Sr_3Fe_2O_x Isostructural with Bi_2Sr_2CaCu_2O_<8+x>

概要

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Single and polycrystalline samples of Bi_2Sr_2SrFe_2O_x (232Fe) are synthesized and studied by Mossbauer spectroscopy. The structure of 232Fe is similar to that of 2212Cu except for a commensurate structure modulation arising from the replacements of the latter's Cu and Ca atoms by Fe and Sr. The Mossbauer spectra of the single crystals show two doublets with different parameters. Calculation of electric field gradient based upon the structure data confirms that the two doublets arise from two different Fe environments induced by the modulation wave: at the antinodes of the wave the oxygen coordination octahedrons are largely distorted and at the nodes far less. The experimental data are well explained accordingly. The Fe valence, isomer shift values, line widths and other Mossbauer data in comparison with the 2212Cu compound are also discussed.
社団法人応用物理学会の論文
1995-08-15