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Abstract:
We present a study of the transition from superconductivity to weak
ferromagnetism as a function of composition in the systems
(Eu1-yRy)2-xCexCuO4 with R = Sm and Gd. T(c) decreases linearly from the
Sm- to the Eu-compound und further in the Gd-doped samples up to y =
0.1. At this composition we observe in the same sample both
superconductivity and weak ferromagnetism. At higher Gd-contents
superconductivity is suppressed and the onset temperature for weak
ferromagnetism increases slightly with y. Our results confirm that this
transition is related to an instability of the T' structure.
