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Electric Field Effects on YBa2Cu3O7-δ Grain Boundary Josephson Junctions
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Various effects of the electric field on YBa2Cu3O7-δ grain boundary Josephson junctions were studied using inverted metal-insulator-superconductor (MIS) samples which employed bicrystal SrTiO3 substrates as insulators. The critical cutrents, I
c of the junctions were regulated by gate voltages with the field-induced changes in charge carrier densities. Furthermore, a significant field effect on equidistant step structures observed in I-V curves was found. The equidistant steps can be ascribed to self-resonances of the ac Josephson current in the grain boundary junctions. The gate voltages shifted the step voltages corresponding to resonance frequencies of the grain boundary toward high voltages. This appears to be a consequence of the field dependence of dielectric properties of grain boundary junctions.
Title: Electric Field Effects on YBa2Cu3O7-δ Grain Boundary Josephson Junctions
Description:
Various effects of the electric field on YBa2Cu3O7-δ grain boundary Josephson junctions were studied using inverted metal-insulator-superconductor (MIS) samples which employed bicrystal SrTiO3 substrates as insulators.
The critical cutrents, I
c of the junctions were regulated by gate voltages with the field-induced changes in charge carrier densities.
Furthermore, a significant field effect on equidistant step structures observed in I-V curves was found.
The equidistant steps can be ascribed to self-resonances of the ac Josephson current in the grain boundary junctions.
The gate voltages shifted the step voltages corresponding to resonance frequencies of the grain boundary toward high voltages.
This appears to be a consequence of the field dependence of dielectric properties of grain boundary junctions.
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