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Phys. Rev. B 68, 014510 (2003) [5 pages]

Paramagnetic effect in YBa2Cu3O7-x grain-boundary junctions

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E. Il’ichev1,*, F. Tafuri2,3, M. Grajcar4,†, R. P. J. IJsselsteijn1, J. Weber1, F. Lombardi5, and J. R. Kirtley3
1Institute for Physical High Technology, P.O. Box 100239, D-07702 Jena, Germany
2INFM–Coherentia Dip. Ingegneria, Seconda Università di Napoli, 81031 Aversa (CE), Italy
3IBM Watson Research Center, Route 134 Yorktown Heights, New York 10598, USA
4Friedrich Schiller University, Institute of Solid State Physics, D-07743 Jena, Germany
5MINA–Chalmers University of Technology and Goteborg University, S-41296 Goteborg, Sweden

Received 17 January 2003; published 29 July 2003

A detailed investigation of the magnetic response of YBa2Cu3Ox grain-boundary Josephson junctions has been carried out using both radio-frequency measurements and scanning superconducting quantum interference device microscopy. In a nominally zero-field-cooled regime we observed a paramagnetic response at low external fields for 45° asymmetric grain boundaries. We argue that the observed phenomenology results from the d-wave order-parameter symmetry and depends on Andreev bound states.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.68.014510
DOI:
10.1103/PhysRevB.68.014510
PACS:
74.50.+r, 74.40.+k, 73.23.Hk, 85.25.Cp

*Electronic address: ilichev@ipht-jena.de

†On leave from Department of Solid State Physics, Comenius University, SK-84248 Bratislava, Slovakia.

 
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