Giant Fluctuation Model and the Field-Induced Broadening of the Superconducting Transition in Oxides
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The concept of the giant fluctuation is proposed with a preliminary model which assumes the field-induced broadening of superconducting transition to be intrinsic to the highly anisotropic superconductor and to be resulting from the state of dynamical mixture of superconductive and non-superconductive microscopical regions of which size is limited by the magnetic field and the coherence length. Recent experimental results are referred to examine the likeliness of this model and to delineate the phenomenon. It is pointed out from the experimental results that essentially the entire transition region is governed by a single mechanism and that its broadening under the magnetic field follows a scaling law ∆T3/2/H. A prediction is made that the remarkable broadening observed for H//c-axis configuration is solely due to the extremely short coherence length along c-axis of the cuprate superconductors and that it cannot be altered by the introduction of the pinning centers.
KeywordsCoherence Length Cuprate Superconductor Condensation Energy Flux Creep Anisotropic Superconductor
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