Hysteresis Effects in Magnetovoltage Measurements in Superconducting

Hysteresis effects in superconducting MgB 2 have been studied systematically by magnetovoltage measurements (V-H curves) as a function of transport current ( I ), temperature (T) and sweep rate of external magnetic field ( H ), (dH/dt). It was observed that time dependent effects appear as the field...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2009-06, Vol.19 (3), p.2744-2747
Main Authors: Olutas, M., Yetis, H., Altinkok, A., Kilic, A., Kilic, K.
Format: Article
Language:English
Subjects:
Current measurement
Flux pinning
High temperature superconductors
Magnetic field measurement
Magnetic flux
Magnetic hysteresis
magnetovoltage
Powders
Shape measurement
Superconducting magnets
Superconductivity
type-II superconductors
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Summary:Hysteresis effects in superconducting MgB 2 have been studied systematically by magnetovoltage measurements (V-H curves) as a function of transport current ( I ), temperature (T) and sweep rate of external magnetic field ( H ), (dH/dt). It was observed that time dependent effects appear as the field sweep rate (dH/dt) varies. This reflects itself as a decrease in the width of V-H loops with decreasing of dH/dt. The dissipation measured in V-H curves does not change as the sweep rate of external magnetic field is varied. It was observed that the measured dissipation in V-H curves is independent of field orientation of H with respect to I . Furthermore, it was observed that there is a significant asymmetry in V-H loops between forward and reverse regions. The physical observations were interpreted mainly in terms of flux de-trapping/trapping and thus the difference in the local fields trapping in the grains between increasing and decreasing branches.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2009.2017878