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Critical currents in proton-irradiated single-crystal Ba2YCu3O7−δ (1990)

van Dover, R. B. ; Gyorgy, E. M. ; White, A. E. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 56 (1990), S. 2681-2683

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Irradiation with 3.5 MeV protons creates defects in Ba2YCu3O7−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 Jc∼1.7×105 A/cm2, decreasing only threefold in a field of 6 T. The fluence and temperature dependence of Jc suggest a model, in which spatially uncorrelated defects pin vortex cores.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.103269

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