Controllable Bi2Sr2CaCu2O8+δ/Au contacts fabricated at liquid-nitrogen 
temperatures

Zhu, X. B.; Zhao, S. P.; Chen, G. H.; Tao, H. J.; Lin, C. T.; Xie, S. S.; Yang, Q. S.

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Controllable Bi₂Sr₂CaCu₂O_8+δ/Au contacts fabricated at liquid-nitrogen temperatures

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Lin, C. T.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Zhu, X. B., Zhao, S. P., Chen, G. H., Tao, H. J., Lin, C. T., Xie, S. S., et al. (2004). Controllable Bi₂Sr₂CaCu₂O_8+δ/Au contacts fabricated at liquid-nitrogen temperatures. Physica C, 403(1-2), 52-56.

Cite as: https://hdl.handle.net/21.11116/0000-000E-FEE4-3

Abstract

Properties of the superconducting surface CuO2 double layers of a
cleaved Bi2Sr2CaCu2O8+delta (BSCCO) crystal in contact with An metal
films are studied using mesa-structured intrinsic Josephson junctions.
We show that a well-defined and experimentally controllable BSCCO/Au
contact can be achieved by the stabilization of the (interstitial)
oxygen atoms in the surface BiO layers at liquid nitrogen temperature
during fabrication. The surface CuO, double layers are found to be in a
metallic contact with An films and have a transition temperature T-c'
of similar to80 K for a BSCCO crystal with bulk T-c of 91 K.
Involvement of impurity atoms or molecules in the BSCCO/Au interface is
found to substantially reduce the value of T-c'. (C) 2003 Elsevier B.V.
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