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Characterization of {\rm Bi}_{2}{\rm Sr}_{2}{\rm CaCu}_{2}{\rm O}_{8+\delta } Stacks Fabricated by Acid Treatment Process

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8 Author(s)
Kato, T. ; Dept. of Electr. Eng., Nagaoka Univ. of Tech nology, Nagaoka, Japan ; Chen, J. ; Sunaga, S. ; Mizumaru, H.
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Bi2Sr2CaCu2O8+δ (Bi-2212) stacks of intrinsic Josephson junctions were fabricated by an acid-treatment process from inside a single crystal. The surrounding acid-treated product is a transparent material, BiOCl. During the process, an optical adhesive (NOA-61) was used to fix a piece of the crystal on a glass substrate and to coat the surface of the sample. The current-voltage characteristics of the stacks at T = 77 K exhibited large hystereses and multiple branches with voltage spacings of approximately 2-3 mV. Under an external microwave field in the frequency range of 2-18 GHz, clear Shapiro steps were observed at voltages with multiples of (h/2e)frf. In addition, the thermal cycling properties of the critical current (Ic) were investigated. No apparent degradation of the Ic was observed during repeated thermal cycling between 300 and 77 K.

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Applied Superconductivity, IEEE Transactions on  (Volume:21 ,  Issue: 3 )