Superconductor-normal-superconductor behavior of Josephson junctions scribed in Y1Ba2Cu3O7−δ by a high-brightness electron source

Applied Physics Letters - Tập 68 Số 26 - Trang 3811-3813 - 1996
B. A. Davidson1, J.E. Nordman1, B. M. Hinaus2, M. S. Rzchowski2, K. Siangchaew3, Matthew Libera3
1Department of Electrical and Computer Engineering, University of Wisconsin, Madison, Wisconsin 53706
2Department of Physics and the Applied Superconductivity Center, University of Wisconsin, Madison, Wisconsin 53706
3Department of Materials Science and Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030

Tóm tắt

We report a substantial improvement in the behavior of Josephson junctions scribed in Y1Ba2Cu3O7−δ films using a high-brightness field-emission electron gun source instead of a lower-brightness thermionic source. These junctions exhibit resistively shunted junction behavior over the entire temperature range from the coupling temperature to at least 4 K, a temperature window which can be larger than 55 K. Superconductor-normal-superconductor character is indicated by the exponential dependence of the critical current on temperature for all temperatures below 90 K. The data demonstrate that electron irradiation under these conditions produces a modified region which is completely normal above 4 K and is narrower in width than previously obtained.

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Thông tin
Thông tin xuất bản

Applied Physics Letters

Tập 68 Số 26

3811-3813

Thông tin tác giả