Mössbauer spectroscopy and X-ray diffractometry were used to study non-superconducting PrBa2Cu3(57Fe)O7-d and superconducting EuBa2Cu3(57Fe)O7-d perovskites. Significant differences were observed in the Mössbauer parameters of Eu- and Pr-containing isostructural cuprates. A relatively high isomer shift was found to be characteristic of iron atoms being present at Cu(1) site in the Pr-containing 1-2-3 compound. This can be considered as a consequence of the suppression of superconductivity, by hole-filling, or by hybridization of Pr states with O and Cu states, via charge transfer mechanism between the Cu(1)-O chain and Cu(2)-O plane.
ASJC Scopus subject areas
- Nuclear and High Energy Physics