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Mössbauer spectroscopy on57Fe in highT c superconductor Bi2Sr2Ca1Cu2O y
Authors:D. Barb  L. Diamandescu  D. Tarină  G. Aldica  E. Cruceanu
Affiliation:(1) Central Institute of Physics, P.O. Box MG-6, Bucharest, Romania
Abstract:Mössbauer measurements were performed on polycrystalline57Fe: Bi2Sr2Ca1Cu2O y , super-conductor in the temperature range of 77–296 K. The samples were obtained in a solid phase synthesis using 0.01, 0.03, 0.1 and 0.5 mol fractions of α-Fe2O3 (96% enriched in57Fe). A prevailing quadrupole doublet practically independent of temperature and iron concentration characterizes the obtained Mössbauer spectra. The corresponding hyperfine parameters suggest the presence of high spin Fe111 ions in a strongly distorted octahedral symmetry which indicates a probable copper substitution by iron in the system.
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