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A class of high-<i>T</i><sub><i>c</i></sub>Y Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7−<i>x</i></sub>grain boundary junctions with high-<i>I</i><sub>c</sub><i>R</i><sub>n</sub>products
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Citations
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References
2005
Year
Materials ScienceReduced Icrn ValuesSuperconducting MaterialHigh-tc SuperconductivityEngineeringPhysicsExperimental AnalysisHigh Icrn ProductsApplied PhysicsCondensed Matter PhysicsSuperconductivityQuantum MaterialsSymmetric 24°High Tc SuperconductorsInterface Structure
The properties of symmetric 24° and asymmetric 45° [100] tilt YBa2Cu3O7−x bicrystal grain boundary junctions (GBJs) have been extensively investigated. A large number of junctions, with dimensions ranging from 2 to 20 µm, have been fabricated and characterized at 4.2 K. Experimental data have been compared with [001] tilt bicrystal and [100] tilt biepitaxial YBa2Cu3O7−x junctions. [100] GBJs show high IcRn products in the range 5–10 mV at T = 4.2 K, these being slightly sensitive to the critical current density values. A direct tunnelling mechanism for both Cooper pair and quasiparticles has been evidenced. The reduced IcRn values of asymmetric 45° with respect to symmetric 24° [100] tilt GBJs have been accounted for by considering a d-wave symmetry of the order parameter using the Sigrist–Rice equation.
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