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IEEE International Superconductive Electronics Conference (ISEC)

Observation of Zero Crossing Shapiro Step on Current-Voltage Curve of Long YBa2Cu3O7-delta Bicrystal Josephson Junction Having Tilted Field Dependence

Masataka Moriya, Tokuyama Takato, Haruna Takahashi, Yoshinao Mizugaki

Published Jul 1, 2015• 0 citations
Publisher

Abstract

A YBa2Cu3O7-δbicrystal Josephson junction was fabricated by electron beam lithography and Ar ion beam etching. The width of the junction (W) was 12 μm and the Josephson penetration length (λJ) was calculated to be 2.36 μm. As W/λJis 5.1, this bicrystal junction is a long Josephson junction. In critical current - magnetic field characteristics, periodicity is not observed, but the maximum value and the minimum value of the critical current are different at a finite magnetic field. In the I-V curve with irradiating the rf signal, the rounded Shapiro step was observed. By applying the magnetic field, the rounded 1st Shapiro step across the zero current axis was observed.

DOI
10.1109/isec.2015.7383476

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