G.M. Fischer, B. Mayer, et al.
IEEE TAS
Paper
Generation of magnetic flux by single grain boundaries of YBa2Cu3O7 − x
Abstract
Using scanning SQUID microscopy, we have directly imaged spontaneously generated delocalized magnetic flux in 45° [001] tilt grain boundaries in YBa2Cu3O7 − x films. Implications for the transport properties of the grain boundaries are discussed. A model based on a dx2 − y2-wave symmetry component of the superconducting order parameter and on grain-boundary faceting is consistent with the results of our experiments. © 1996 The American Physical Society.
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