Accurate determination of the Mössbauer spectrum hyperfine parameters and correlation withTc in YBa2Cu3−x57Fe x O7−δ (0.01≦x≦0.15)
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High statistics room temperature Mössbauer spectra have been performed on ten YBa2Cu3−xFe x O7−δ (0.01≦x≦0.15) samples. The different fit solutions (including broadening of the lines) are tested with “χ2” factor analysis. Only two solutions are valid with almost similar parameters. The results on present samples and our previous results on various materials made under different heat treatments show thatTc is governed byx and the relative population of one of the iron species. These species can be related to highly coordinated irons in the chains.
KeywordsIron Thin Film Heat Treatment High Statistic Accurate Determination
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