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Josephson junctions with bulk YBa2Cu3O7-x, Bi2Sr2 CaCu2Ox and Tl2Ca2Ba 2Cu3O10+x

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6 Author(s)
Eidelloth, W. ; Dept. of Electr. & Comput. Eng., Colorado Univ., Boulder, CO, USA ; Barnes, F.S. ; Geller, S. ; Wu, K.Y.
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The characteristics of point contacts with combinations of Pb, YBa 2Cu3O7-x, Bi2Sr2CaCu2Ox, (YBCO), (BSCCO), and Tl2Ca2Ba2Cu3O 10+x (TCBCO) have been measured in a shielded liquid helium dewar. Zero-voltage currents were found in all arrangements; diffraction patterns in the voltage-flux curves were observed with all materials. Electron pairs were confirmed as carriers in all investigated high-T c materials. All junctions resembled weak-link bridge structures rather than tunnel junctions. Despite strong shunting, hysteresis was found in the I-V curves of some point contacts. A structure of unknown origin was found in the I-V curves of YBCO-BSCCO junctions. Both YBCO-YBCO and BSCCO-BSCCO junctions had much lower normal resistances and considerably higher critical currents than YBCO-BSCCO point contacts. The reason for this phenomenon is not yet understood

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Magnetics, IEEE Transactions on  (Volume:25 ,  Issue: 2 )