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Intrinsic BSCCO Josephson junctions on off-axis substrates

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6 Author(s)
Kawahara, T. ; Fac. of Technol., Tokyo Univ. of Agric. & Technol., Japan ; Ishibashi, T. ; Kaneko, H. ; Sato, K.
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Anisotropic transport and microwave properties of intrinsic Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ (2212) Josephson junctions fabricated on off-axis substrates were studied. The twin-free thin film 2212 Josephson junctions have been prepared by molecular beam epitaxy (MBE) on LaAlO/sub 3/ [001] substrates tilted 6/spl deg/ toward the [110] direction, and were patterned into a line shape along [110] LaAlO/sub 3/ with 20 /spl mu/m in width. We found that the anisotropy parameter /spl gamma/ was increased from 76 to 120 by the annealing at temperature of 320-350/spl deg/C in the MBE chamber. The coherent Josephson radiation from stacked 2212 intrinsic junctions and their modulation under applied magnetic field were observed at frequency f/sub REC/=1.7 GHz by using a nonresonant detection method. These results confirmed the occurrence of the mutual phase locking of the stacked series array of intrinsic junctions along the c-axis.

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Applied Superconductivity, IEEE Transactions on  (Volume:9 ,  Issue: 2 )