We report here on the preparation, effect of heat treatments, X-ray diffraction and AC magnetic susceptibility measurements in the high T c superconductor (Y 1-x Sm x )(SrBa)Cu 3 O 6+z (x = 0, 0.2, 0.4, 0.5, 0.6, 0.8 and 1). Each sample was subject to two types of heat treatment: oxygen annealing [O] and argon annealing followed by oxygen annealing [AO].
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