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Using a deep submicron structuring process for oxide superconducting films, we have fabricated planar YBa2Cu3O7−δ-Ag-YBa2Cu3O7–δ proximity junctions operating in the liquid nitrogen temperature region. Under microwave radiation Shapiro steps are generated in the current-voltage characteristic, in accordance with the resistively shunted junction model.
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Gijs et al. (1991) studied this question.
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