Applied Physics Letters · 1993 · 39 citations · 10 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsSolid State PhysicsElectrical ConductivityMagnetic Properties Of SolidsSuperconducting MaterialsCritical Current DensityDissipative MechanismsGrain BoundariesHigh-temperature SuperconductorsMagnetic Field DependenceMaterial Behaviour At Elevated TemperaturesSuperconducting PropertiesSuperconducting Tapes
Detailed measurements of I-V curves at 4.2, 65, and 77 K as a function of applied magnetic field for two Bi(2:2:2:3)/Ag tapes, having critical current densities Jc of ∼1 and ∼2×104 A/cm2 (at 77 K and 0 T), revealed that (1) the primary limiting factor for the transport critical current densities in these tapes is the presence of a large fraction of weak and/or nonsuperconducting grain boundaries; (2) the observed dissipative voltages are due, however, mostly to the motion of the magnetic vortices in the grains; and (3) the E-J curves are well described by an expression, E∼exp[−(J0/J)μ], rather than the commonly used power law, i.e., E∼Jn, where μ, J0, and n are constants.
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Theory of collective flux creep
M. V. Feigel’man, V. B. Geshkenbeǐn, A. I. Larkin et al. · Physical Review Letters · 1989 · 1.1K citations
Experimental evidence for vortex-glass superconductivity in Y-Ba-Cu-O
R. H. Koch, V. Foglietti, W. J. Gallagher et al. · Physical Review Letters · 1989 · 977 citations · Full text