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APS » Journals » Phys. Rev. Lett. » Volume 89 » Issue 6
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Phys. Rev. Lett. 89, 067004 (2002) [4 pages]

Observation of Splintered Josephson Vortices at Grain Boundaries in YBa2Cu3O7-δ

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R. G. Mints and Ilya Papiashvili
School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel

J. R. Kirtley
IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598

H. Hilgenkamp
Low Temperature Division, Department of Applied Physics and MESA+ Research Institute, University of Twente, P.O. Box 217, 7500 Enschede, The Netherlands

G. Hammerl and J. Mannhart
Experimentalphysik VI, Center for Electronic Correlations and Magnetism, Institute of Physics, Augsburg University, D-86135 Augsburg, Germany

Received 18 April 2002; published 23 July 2002

We have directly observed well-separated Josephson vortex splinters with unquantized magnetic flux at asymmetric 45° grain boundaries in YBa2Cu3O7-δ films by imaging magnetic flux with scanning SQUID microscopy. The existence of these splinter vortices has been predicted and is well described by a model based on dx2-y2 pairing symmetry and facetting of the grain boundary on a length scale shorter than the Josephson penetration depth.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.067004
DOI:
10.1103/PhysRevLett.89.067004
PACS:
74.60.Ge, 74.50.+r
 
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