Abstract
Ramp-type Josephson junctions with a Nd2CuO4 (NCO) barrier have been fabricated on (001)-SrTiO3 using RF magnetron sputtering. Such an NCO barrier has a highly stable T′-214 structure and is chemically compatible with the 123-superconductors. The lattice constant and thermal expansion coefficient of YBa2Cu3Oy and NCO being very similar ensures a high transparency at the superconductor/barrier interface, thus significantly increasing the reproducibility. Its resistivity is also remarkably higher than that of many currently used barrier materials. These junctions showed a typical resistively shunted junction-like current–voltage characterization and Shapiro steps under irradiation using a microwave field. The current uniformity of these junctions has also been enhanced significantly. The temperature dependence of the junction parameters and the scaling behaviour are discussed and compared with other high temperature Josephson junctions.
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