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9 Feb 1998

Volume 72, Issue 6, pp. 627-747

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Temperature dependence of the current-phase relation for YBa2Cu3O7−x step-edge Josephson junctions

E. Il’ichev, V. Zakosarenko, V. Schultze, H.-G. Meyer, H. E. Hoenig, V. N. Glyantsev, and A. Golubov

Appl. Phys. Lett. 72, 731 (1998); http://dx.doi.org/10.1063/1.120858 (3 pages) | Cited 15 times

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Show Abstract
The current-phase relation (CPR) of YBa2Cu3O7−x step-edge Josephson junctions was investigated experimentally at various temperatures. The investigated junctions were incorporated into a washer-shaped superconducting ring with inductance L ∼ 300 pH. The ring was inductively coupled to a tank circuit with a resonance frequency between 9 MHz and 40 MHz. The CPR was obtained from the measurement of the impedance of the phase-biased junction. At high temperatures and low critical current the experimentally observed CPR is sinusoidal. The same results were obtained at low temperatures when the rms flux noise in the ring is negligible. In the case of larger critical current and finite noise, deviations of the apparent CPR from sinusoidal dependence were found. The deviations can be described by thermal fluctuations of the magnetic flux in the ring. © 1998 American Institute of Physics.
Show PACS
74.72.-h Cuprate superconductors
74.50.+r Tunneling phenomena; Josephson effects
74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
74.25.Sv Critical currents
74.40.-n Fluctuation phenomena
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