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Resistive Crossover Phenomena at High Vortex Velocities in Superconducting YBa2Cu3O7-δ
並列摘要
The strong nonequilibrium quasiparticle distribution established at high vortex velocities leads to an electronic instability at a maximum velocity u;, as first predicted by Larkin and Ovchinnikov. In epitaxial c-axis oriented films of YBa2Cu3O7-δ we have observed two crossover phenomena in this highly nonlinear resistive behavior. First, at low magnetic fields B the spatial homogeneity requirement for the quasiparticle distribution results in the proportionality vФ^-～B^-1/2, whereas above the crossover field we have vФ^- = const. Second, at temperatures approaching Tc the discontinuity in the electric resistance disappears when the inelastic quasiparticle scattering rate Tin^-1 becomes equal to (kB/h)(Tc - T).
並列關鍵字
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延伸閱讀
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