Evidence for twin plane superconductivity in small particles of YBa2Cu3O7−δ

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We have performed magnetic orientation experiments with small grains (d < 20μ) of YBa2Cu3O7−δ below To. Our results of magnetic susceptiblity and levitation, can not be explained with the assumption of bulk anisotropic superconductivity; however, they can on the hypothesis that the twin boundary planes carry supercurrents.

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