Pinning model derived from resistive measurements on melt processed Bi2Sr2CaCu2O8
作者： H.W. Neumüller , G. Ries
DOI: 10.1016/0921-4534(89)90423-1
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摘要: Abstract On melt processed samples of the 86 K superconductor Bi 2 Sr CaCu O 8 we have performed resistive measurements in low field limit B ⩽0.13 T and 40 K⩽ ⩽77 K. The voltage drop is found to rise exponentially with current E ∝exp j / 0 , which interpreted terms thermal activation pinned flux lines. An energy U ( )⩽90 meV derived from transition width ) related a plausible core pinning interaction lines normal conducting precipitates. This reproduces measured c B, values whole regime investigated. We conclude that centers must minimum size order control creep. Finally demonstrate conventional summation single site forces cannot account for observed macroscopic depinning density.
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