Abstract
Single-layer Josephson junctions and dc superconducting quantum interference devices (SQUIDs) have been prepared from epitaxial, laser-deposited thin films of Bi2Sr2CaCu2O8+x on (001) SrTiO3 bicrystals with a misorientation angle of 36.8°. The current-voltage characteristics of the Josephson junctions are of resistively shunted junction type. The Ic(B) patterns look rather periodical and symmetrical but show clear irregularities in comparison to an ideal Fraunhofer-like pattern. However, the supercurrent can be suppressed almost completely by applying an external magnetic field. The best dc-SQUID—with a SQUID hole of 5 μm×20 μm and an estimated inductance of about 36 pH—works up to 77 K. At 76 K the flux to voltage conversion ∂V/∂Φ at the appropriate flux bias is 20 μV/Φ0. The best equivalent flux noise which was measured in the flux locked loop mode at 62 K is 25 μΦ0/√Hz at 1 Hz and 4 μΦ0/√Hz in the white noise region for f≥350 Hz, corresponding to an energy resolution of 4×10−29 J/Hz at 1 Hz and 9×10−31 J/Hz in the white noise region.
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