Effects of Al2O3 Nano-Particles on the Irreversible Properties of MgB2 Superconductor

Magnetic measurements on MgB2 superconductors doped with various concentration (0 < x < 0.6%) of Al2O3 nano-particles (~20 nm) have been performed in the temperature range 4-40K and in a magnetic field of strength up to 9 Tesla. A significant increase in the irreversibility field (Hirr), criti...

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Bibliographic Details
Main Authors: Ziq, Kh A, Shahabuddin, M, Ansari, I, Salem, A F, Singh, K, Kishan, H
Format: Conference Proceeding
Language:English
Online Access:Get full text
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Summary:Magnetic measurements on MgB2 superconductors doped with various concentration (0 < x < 0.6%) of Al2O3 nano-particles (~20 nm) have been performed in the temperature range 4-40K and in a magnetic field of strength up to 9 Tesla. A significant increase in the irreversibility field (Hirr), critical current density (Jc) and remanent magnetization (MR) have been obtained with increasing the concentration of the Al2O3 nano-particle. At low field we have observed large vortex instabilities (known as vortex-avalanche) associated with all doped samples characterized with high critical current density. Vortex avalanche effect is reduced with increasing temperature vanishing near 20K. The results are discussed in terms of local-vortex instabilities caused by doping of Al2O3 nano-particles.
ISSN:0094-243X
DOI:10.1063/1.2776704