Comparison of the critical current density of a polycrystalline MgB2 superconductor by ac-susceptibility and Bean’s model
Journal Article
Alzayed, Intikhab A Ansari, M Shahabuddin and Nasser Saleh . 2011
Publication Online URL:
Magazine \ Newspaper:
PHYSICA SCRIPTA
Issue Number:
84
Pages:
065701
Publication Abstract:
In this paper, the critical current density measured from the real part of ac-susceptibility is in agreement with that calculated from Bean’s formula at constant frequency ( f = 98 Hz) in the temperature range 30–38K for a pure MgB2 sample. The temperature dependence of the imaginary part of ac-susceptibility (00–T ) shows the shifts in absorption peaks towards the lower temperature when the applied field is increased. Scanning electron microscopy images confirmed the synthesis of a good sample and agglomerates with fine grains.