Harmonic current-phase relation in Nb-Al-based superconductor/insulator/normal conductor/insulator/superconductor-type Josephson junctions between 4.2 K and the critical temperature

Go¨tz, M.; Khanin, V. V.; Schulze, H.; Zorin, A. B.; Niemeyer, J.; Il'ichev, E.; Chwala, A.; Hoenig, H. E.; Meyer, H.-G.
August 2000
Applied Physics Letters;8/28/2000, Vol. 77 Issue 9
Academic Journal
For a study of the supercurrent-phase relationship, we have fabricated Nb/Al/AlO[sub x]/Al/AlO[sub x]/Al/Nb-based Josephson junctions of low critical current density. At 4.2 K, junctions of a nominal area of 10x10 μm[sup 2] showed a nonhysteretic dc current-voltage characteristic with a critical current of about 10 μA. Similar junctions were part of washer-type rf superconductor quantum interference devices. These samples were inductively coupled to high-quality tank circuits for measurements at 4.2 K or at higher temperatures up to values close to the critical temperature of niobium. In this range, the current-phase relation, as deduced from impedance measurements of the phase-biased junction, did not deviate significantly from the sinusoidal shape. © 2000 American Institute of Physics.


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