Superconducting current-phase relation in Nb/Au/(001)YBa2Cu3Ox heterojunctions

Details Superconducting current-phase relation in Nb/Au/(001)YBa2Cu3Ox heterojunctions Superconducting current-phase relation in Nb/Au/(001)YBa2Cu3Ox heterojunctions

2000-08-04

arxiv.org/abs/cond-mat/0008077v2

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

We probe directly the superconducting current-phase relations (CPR) of Nb/Au/(001) YBa2Cu3Ox heterojunctions prepared in epitaxial c-axis oriented YBa2Cu3Ox (YBCO) thin films. The measurements are performed by a single-junction interference experiment. Atomic Force Microscope observations and estimations made from I-V characteristics confirm the c-axis current transport. No deviation of the current-phase relation from a sinusoidal shape has been found within the experimental accuracy. Possible reasons of the absence of the second harmonic in the CPR due to a second order tunneling are discussed.

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