Superconducting current-phase relation in high-Tcsymmetrical bicrystal junction

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The current-phase relation (CPR) of a YBa2Cu3OxJosephson junction (JJ) on a bicrystal sapphire substrate was determined using the dependences of the amplitudes of the harmonic and subharmonic Shapiro steps and the critical current dependences of the DC-SQUIDs on external magnetic field. The deviations of CPR from sinusoidal one, caused by asymmetric dc biasing, result in an appearance of subharmonic Shapiro steps and in asymmetric shape of the SQUID modulation of the Ic(H) dependence. Precise measurements suppose sinusoidal CPR for symmetrical bicrystal junctions, while for asymmetric current flow in JJ the contribution of second harmonic in CPR increases monotonously. © 2001 Elsevier Science B.V. All rights reserved.




Borisenko, I. V., Mozhaev, P. B., Ovsyannikov, G. A., Constantinian, K. Y., & Stepantsov, E. A. (2002). Superconducting current-phase relation in high-Tcsymmetrical bicrystal junction. In Physica C: Superconductivity and its Applications (Vol. 368, pp. 328–331).

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