Abstract
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.
Original language | English |
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Pages (from-to) | 3811-3813 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 68 |
Issue number | 26 |
DOIs | |
State | Published - 1996 |