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May 2012

Volume 30, Issue 3, Articles (03xxxx)

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J. Vac. Sci. Technol. A 30, 030802 (2012); http://dx.doi.org/10.1116/1.4705402 (28 pages)

Tobias Hanrath
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Improved characteristics of mesa-type intrinsic Josephson junctions by vacuum cleavage process for Bi2Sr2CaCu2O8+δ/Au contacts

Hiroki Ishida, Takahiro Kato, Atsushi Saito, and Kanji Yasui

J. Vac. Sci. Technol. A 30, 031101 (2012); http://dx.doi.org/10.1116/1.4707151 (7 pages)

Online Publication Date: 27 April 2012

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Improvement in the quality of stacked intrinsic Josephson junctions (IJJs) was attempted using Bi2Sr2CaCu2O8+δ (Bi-2212) single crystals. The introduction of a clean Bi-2212/Au interface reduced contact resistivity (ρc), decreased low frequency noise, and suppressed the drop in the maximum Josephson current (Ic), which are very important factors for applications such as a superconducting quantum interference device. The ρc of samples produced by crystal cleavage in air or vacuum were, respectively, 8.2 × 10−5 and 7.0 × 10−6 Ω cm2 at 300 K and 8.2 × 10−5 and 2.1 × 10−6 Ω cm2 at 77 K. Random-telegraph voltage noise observed with the air-cleaved samples did not occur for the samples cleaved in a vacuum. The degradation of Ic was suppressed for IJJs produced by the vacuum cleavage process.
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74.50.+r Tunneling phenomena; Josephson effects
74.72.-h Cuprate superconductors
74.25.fc Electric and thermal conductivity
73.40.Cg Contact resistance, contact potential
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