Title

Critical Currents in Proton-Irradiated Single-Crystal Ba 2ycu3o7-Δ

Document Type

Article

Publication Date

12-1-1990

Abstract

Irradiation with 3.5 MeV protons creates defects in Ba2YCu 3O7-δ, which can act as strong pinning sites, comparable to those produced by neutron irradiation. Indeed protons as well as neutrons undergo momentum-transferring collisions that result in atomic displacements; the additional electronic proton-solid interaction does not appear to yield defects which contribute to pinning. Under optimized conditions we have obtained Jc(T→0, H=1 T)∼2×107 A/cm2 in single crystals. At 77 K the value is still J c∼1.7×105 A/cm2, decreasing only threefold in a field of 6 T. The fluence and temperature dependence of J c suggest a model, in which spatially uncorrelated defects pin vortex cores.

DOI

10.1063/1.103269

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