Abstract
The compounds GdBa 2 (Cu 1−x Fe x ) 3 O 7+z have been prepared to study the effect of partial replacement of Cu by Fe on the structure, superconductivity and magnetic behavior of this oxide system. A change from orthorhombic to tetragonal structure takes place with increasing x. The superconducting transition temperature, T c , decreases as the Fe concentration increases. All the compounds exhibit Curie-Weiss behavior in their magnetic susceptibility which is dominated by the paramagnetism of the Gd 3+ ion.
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