Volume 64, Number 4, November 2003
|Page(s)||489 - 495|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 November 2003|
Pairing symmetry in
Experimentalphysik VI, Center for Electronic Correlations and Magnetism
Institute of Physics, Augsburg University - D-86135
2 Department of Physics, University of Illinois at Urbana-Champaign 1110 W. Green Street, Urbana, IL 61801, USA
3 Laboratoire de Physique des Solides, Université de Paris-Sud - 91405 Orsay, France
Accepted: 28 August 2003
Although the pairing symmetry of the high- superconductors is widely accepted to be , measurements in apparent contradiction with this picture have been reported in and attributed to s-wave symmetry or complex mixtures of s-wave and d-wave. To clarify this issue, we have measured the transport properties of asymmetric / bicrystal Josephson junctions, a geometry sensitive to the pairing symmetry. All samples investigated show complicated but polarity-symmetric modulation of their critical currents with magnetic field, providing unambiguous, clear evidence for a predominant pairing symmetry at interfaces.
PACS: 74.20.Rp – Pairing symmetries (other than s-wave) / 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 74.78.Bz – High- films
© EDP Sciences, 2003
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