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Flux Pinning in Melt-Grown NdBa2Cu3Oy and SmBa2Cu3Oy Superconductors
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REBa2Cu3O
y
superconductors with rare earth (RE) ions with large radii (RE: La, Nd, Sm) exhibit relatively low T
c due to the presence of RE-Ba solid solution. We have found that this solid solution can be suppressed if these superconductors are melt processed in a reduced oxygen atmosphere. We have also found that critical current densities of these superconductors are higher than those of melt processed YBa2Cu3O
y
with fine Y2BaCuO5 inclusions in a high field region. The irreversibility line was also shifted toward the higher H-T region. We believe that flux pinning in these superconductors is ascribable to a finely distributed RE(Ba1-
x
, RE
x
)2Cu3O
y
phase in a good superconductive matrix.
Title: Flux Pinning in Melt-Grown NdBa2Cu3Oy and SmBa2Cu3Oy Superconductors
Description:
REBa2Cu3O
y
superconductors with rare earth (RE) ions with large radii (RE: La, Nd, Sm) exhibit relatively low T
c due to the presence of RE-Ba solid solution.
We have found that this solid solution can be suppressed if these superconductors are melt processed in a reduced oxygen atmosphere.
We have also found that critical current densities of these superconductors are higher than those of melt processed YBa2Cu3O
y
with fine Y2BaCuO5 inclusions in a high field region.
The irreversibility line was also shifted toward the higher H-T region.
We believe that flux pinning in these superconductors is ascribable to a finely distributed RE(Ba1-
x
, RE
x
)2Cu3O
y
phase in a good superconductive matrix.
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