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Observation of the second harmonic in superconducting current-phase relation of Nb/Au/(001)YBa2Cu3Ox heterojunctions

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arxiv cond-mat/0106559 v1 pith:OZMZMLN2 submitted 2001-06-27 cond-mat.supr-con

P. V. Komissinski , E. Il'ichev , G.A. Ovsyannikov , M. Grajcar , R. Hlubina , S. A. Kovtonyuk , Z. Ivanov , Y. Tanaka
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N. Yoshida S. Kashiwaya
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classification cond-mat.supr-con
keywords secondyba2cu3oxharmonicbeencurrent-phasefilmsfirstheterojunctions
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The superconducting current-phase relation (CPR) of Nb/Au/(001)YBa2Cu3Ox heterojunctions prepared on epitaxial c-axis oriented YBa2Cu3Ox 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 YBa2Cu3Ox thin films is of the d+s type

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