Abstract
Since the discovery of High-Tc Superconductors (HTSCs), considerable efforts have been made to understand the effect of impurity ions on the superconducting behavior. Mossbauer spectroscopy has contributed considerably to the understanding of superconductors with impurities. Many papers focus on Mossbauer studies of Fe-doped YBa2Cu3O7-x compounds. Although it is universally accepted that CuO planes play a major role in the transport properties of superconducting copper oxides, the mechanism of the substitution of Cu by Fe ions has attracted much attention in the literature. Now it is known that Fe substitutes both Cul-chain and Cu2-plane sites in the lattice. The Mossbauer method gives valuable information about the local properties around Fe ions, such as site symmetry, local distortion, valence state and magnetic ordering.
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