Superconducting current-phase relation in Nb/Au/(001)YBa2Cu3Ox heterojunctions
Komissinski, P. V. · Il'ichev, E. · Ovsyannikov, G. A. · Kovtonyuk, S. A. · Grajcar, M. · Ivanov, Z. · Tanaka, Y . · Yoshida, N. · Kashiwaya, S.
Original · EN
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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