Improved characteristics of mesa-type intrinsic Josephson junctions by vacuum cleavage process for Bi2Sr2CaCu2O8+δ/Au contacts
(Color online) Bi-2212 single-crystal pieces. (a) Pieces harvested from a sintered bulk. (b) AFM image of a cleaved surface.
ρ c dependence of P BP .
(Color online) Voltage noise caused by Bi-2212/Au contacts at 77 K. (a) Noise power spectra and (b) time series data of voltage fluctuations.
(Color online) Mesa-type IJJ; (a) schematic diagram of the cross section and (b) top view schematic and photograph.
(Color online) Double-side type IJJ: (a) three-dimensional schematic diagram and (b) top view photograph.
(Color online) I–V curves of mesa-type IJJs prepared with the vacuum cleavage process at 77 K. (a) Four terminals and (b) three terminals.
(Color online) Typical I–V curves of IJJs in the low voltage region for (a) air- and (b) vacuum-cleaved mesa types and (c) the double-side type. The multiple branches in (c) were obtained using the persistence function of the oscilloscope.
(Color online) I c of the nth junction normalized on the basis of the tenth junction.
Au deposition conditions.
ρ c For the Bi-2212/Au interface at 300 and 77 K (Ω cm2).
Fitting parameters determined from Eq. (1).
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