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Generation of Magnetic Flux by Single Grain Boundaries of YBa 2 Cu 3 O 7 <mml:mo…

1996; American Physical Society; Volume: 77; Issue: 13 Linguagem: Inglês

10.1103/physrevlett.77.2782

1092-0145

J. Mannhart, H. Hilgenkamp, Bernd Mayer, Ch. Gerber, J. R. Kirtley, Kathryn A. Moler, Manfred Sigrist,

Advanced Condensed Matter Physics

Using scanning SQUID microscopy, we have directly imaged spontaneously generated delocalized magnetic flux in 45\ifmmode^\circ\else\textdegree\fi{} [001] tilt grain boundaries in ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}x}$ films. Implications for the transport properties of the grain boundaries are discussed. A model based on a ${d}_{{x}^{2}{\ensuremath{-}y}^{2}}$-wave symmetry component of the superconducting order parameter and on grain-boundary faceting is consistent with the results of our experiments.