Josephson tunneling for magnetic fields perpendicular to discrete Nb junctions: Implications for the irreversibility crossover in high-temperature superconductors

D. H. Kim; K. E. Gray; J. H. Kang

doi:10.1103/PhysRevB.45.7563

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Josephson tunneling for magnetic fields perpendicular to discrete Nb junctions: Implications for the irreversibility crossover in high-temperature superconductors

D. H. Kim, K. E. Gray, J. H. Kang

DOI 10.1103/PhysRevB.45.7563 · Physical Review B

T1

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Abstract

It was recently suggested that coupling between the superconducting Cu-O bilayer or trilayer units in the t/Ihighly anisotropic, high-temperature superconductors (HAHTS) can be described by n/Iincoherent Josephson tunneling. This paper confirms the assumed inverse dependence of the coupling energy on field, H, through measurements of the zero-bias resistance of discrete, high-quality, thin-film Nb Josephson junctions. This 1/H dependence was used to explain the flux-motion-induced broadening of resistive transitions in HAHTS for the equivalent geometry with H parallel to the c axis. The Nb junction results also unambiguously confirm another recent suggestion: that field-induced dissipation can occur in Josephson junctions without the motion of vortices from an externally applied field, which in this case are pinned in the Nb electrodes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.2	Pressure not reported	unknown
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown