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- W2000786091 abstract "Abstract Alterations in the oxygen stoichiometry are known to affect the structure, electronic behavior and transition temperature ( T C ) of YBa 2 Cu 3 O 7− x (YBCO). At this stage it is interesting to explore the implications on superconducting quantum interference devices (SQUIDs) properties and parameters. In this sense we have analyzed the effects of changing oxygen microstructure of both, barrier and electrodes, of the YBCO grain boundary Josephson junctions (GBJs) forming our SQUIDs. Two different processes have been used: oxygen annealing ( x =0.25, 0.35 and 0.5) and helium irradiation. Oxygen annealings always cause an increase of the barrier width that can be interpreted in the framework of the band-bending theory. An increase of the magnetic penetration depth ( λ L ) of the electrodes is always induced. However, λ L values are higher in oxygen-deficient than in irradiated junctions with similar T C indicating that irradiation produces defects in both Cu–O chains and CuO 2 planes. Although critical currents across the barrier can interestingly increase after irradiation, the degradation of the electrode properties limits SQUID performance at 77 K. In spite of that, we find that the magnetic-flux-to-voltage transfer function of the SQUIDs can increase after irradiation. Irradiation can also be regarded as a tool to controllably modify the shape of voltage modulation curves altering the position of the step resonances." @default.
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- W2000786091 date "2002-08-01" @default.
- W2000786091 modified "2023-10-11" @default.
- W2000786091 title "Oxygen influence on YBa2Cu3O7−x superconducting quantum interference devices made on bicrystals: effects on electrodes and barriers" @default.
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- W2000786091 doi "https://doi.org/10.1016/s0921-4534(02)00816-x" @default.
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