Abstract
Nanophase Al 2O 3 powders were added to TlBa 2Ca 2Cu 3O x powders in 20 mol.% concentrations. Pellets produced from powders with and without nonaphase oxides were heated in O 2 above the peritectic melting temperatures and cooled at 10°C/h. For temperatures ≤35 K, the intragranular critical current density, J c, increased dramatically for all specimens with the Al 2O 3 additions. However, no significant changes in J c with Al 2O 3 additions were observed at 77 K. The enhancement in J c appears to be associated with the presence of nanometer-sized inclusions in the superconductor. The pinning by the inclusions can be understood by considering the interaction between flux lines and cavities. It is shown that for pinning by such cavities to be effective, the cavities must be small, numerous, and well-distributed.
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