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Flux trapping in a macroscopic cylinderical hole drilled in Bi-Sr-Ca-Cu-O
Authors:A Kiliç  K Kiliç  H Yetiş  M Olutaş  A Altinkok  H Sözeri  O Çetin
Institution:(1) Department of Physics, Turgut Gulez Research Laboratory, Abant Izzet Baysal University, 14280 Bolu, Turkey;(2) National Metrology Institute TUBITAK P.O. Box 21, 41470, Gebze-Kocaeli, Turkey
Abstract:The flux dynamics in a polycrystalline sample of Bi1.7Pb0.3Sr2Ca2Cu3Ox with a macroscopic cylindrical hole (CH) drilled was investigated by slow transport relaxation (V-t curves) and magnetovoltage measurements (V-H curves). It was monitored that there are several discontinuities in the time evolution of quenched state in V-t curves, which was attributed to the leaving of quantized flux lines trapped through CH together with surface superconducting effects. We observed that asymmetric V-H curves demonstrate unusual remarkable counter clockwise hysteresis effects upon cycling of field. This interesting result was correlated mainly to the flux trapping inside the CH that acts as a macroscopic attractive pinning center for flux lines. Further, the hysteresis effects in V-H curves for a fixed transport current provide a direct evidence that the number of flux lines, measured dissipation and relative decrease/increase in irreversibilities could be determined by sweeping rate of external magnetic field (dH/dt) which leads also to peculiar time effects.
Keywords:74  72  Hs Bi-based cuprates  74  25  Qt Vortex lattices  flux pinning  flux creep
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