Flux trapping in a macroscopic cylinderical hole drilled in Bi-Sr-Ca-Cu-O

A. Kiliç (), K. Kiliç, H. Yetiş, M. Olutaş, A. Altinkok, H. Sözeri and O. Çetin

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 50, issue 4, 565-569

Abstract: The flux dynamics in a polycrystalline sample of Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O x 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. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Keywords: 74.72.Hs Bi-based cuprates; 74.25.Qt Vortex lattices; flux pinning; flux creep (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00180-3

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