Abstract
We have measured the magnetic irreversibility of the YBa 2−x D x Cu 3 O 7−δ ( D= Sr or Ca and x=0.5 or 1.0) polycrystalline superconductors in fields up to 7 kOe and of an oxygen depleted YBa 1.75Sr 0.25Cu 3O 6.85 polycrystalline sample in fields up to 40 kOe as well as the fluctuation magnetoconductivity of YBa 1.5 D 0.5 Cu 3 O 7−δ ( D= Sr or Ca ) up to 300 Oe. These partial substitutions of Ba as well as oxygen depletion cause reduction of T c proportional to the impurity concentration and an increase of the granular superconducting character, maintaining almost unchanged the overall aspect of the magnetic irreversibility and fluctuation conductivity. Our results show that in a low field region the flux dynamics is dominated by the intergranular Josephson flux, that is strongly marked by the conflicting and frustrated grain coupling physics, the magnetic irreversibility totally resembling that of the spin glasses. But in fields above 10 kOe the flux dynamics is more conventional.
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