Volume 57, Number 4, February 2002
|Page(s)||585 - 591|
|Section||Condensed matter: electronic structure, electrical, magnetic, and opticalproperties|
|Published online||01 September 2002|
Observation of the second harmonic in superconducting current-phase relation of Nb/Au/(001)YBa2Cu3Ox heterojunctions
Department of Microelectronics and Nanoscience,
Chalmers University of Technology and Göteborg University -
S-412 96, Göteborg, Sweden
2 Institute of Radio Engineering and Electronics, RAS - Moscow 101999, Russia
3 Institute for Physical High Technology, Department of Cryoelectronics P.O. Box 100239, D-07702 Jena, Germany
4 Department of Solid State Physics, Comenius University Mlynská Dolina, SK-842 48 Bratislava, Slovakia
5 Department of Applied Physics, Nagoya University - 464-8603, Nagoya, Japan
6 Electrotechnical Laboratory - Umezono, Tsukuba, Ibaraki, 305-8568, Japan
Corresponding author: email@example.com
Accepted: 20 November 2001
The superconducting current-phase relation (CPR) of Nb/Au/(001)YBa2Cu 3Ox heterojunctions prepared on epitaxial c-axis–oriented YBa 2 Cu3Ox thin films has been measured in a single-junction interferometer. For the first time, the second harmonic of the CPR of such junctions has been observed. The appearance of the second harmonic and the relative sign of the first and second harmonics of the CPR can be explained assuming that the macroscopic pairing symmetry of our YBa2Cu3O thin films is of the d+s type.
PACS: 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 73.40.Gk – Tunneling / 74.80.Fp – Point contacts; SN and SNS junctions
© EDP Sciences, 2002
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