Abstract
57Fe Mossbauer measurement have been performed in the Fe-doped high-Tc phase of Bi-system superconductor. Isomer shifts display presence of Fe3+ ions in square and pyramidal coordinations. Regarding the high-Tc superconductors as primarily ionic crystals and using effective valence and point charge model, we have calculated the electric field gradients for Fe as a replacement for Cu in the high-Tc phase. Good agreement between theory and experiment is obtained.
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