| Original Articles |
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JOSEPHSON EFFECTS IN Nb/YBa2Cu307-δ POINT CONTACTS AND YBa2Cu307-δ BREAK JUNCTIONS |
| ZHAO Shiping;TAO Hongjie;CHEN Yingfei;YANG Qiansheng;LIAO Qide*;A Shao*;XU Xiaozhen* |
| Institute of Physics, Academia Sinica, Beijing
*Department of Physics, Central In stitute of Nationalities, Beijing
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| Cite this article: |
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ZHAO Shiping, TAO Hongjie, CHEN Yingfei et al 1988 Chin. Phys. Lett. 5 249-252 |
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Abstract Josephson effects have been observed in Nb/YBa2Cu307-δ point
contacts and YBa2Cu307-δ break junctions. When the junctions are exposed to a microwave field, the I -V characteristics show constant voltage steps, the heights of which follow the Bessel function behavior. Obvious asymmetry about zero bias has been observed in YBCO break junctions which, we suggest, may possibly result from flux trapping in the complicated weak link structure of the system. Micrmave-induced sub-steps have also been found in YBCO break junctions. All experiments were conducted at liquid helium temperature.
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Published: 01 June 1988
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