TITLE

Effects of the sintering temperature on the flux-pinning mechanism and the activation energy of malic-acid doped MgB2

AUTHOR(S)
Ghorbani, S. R.; Bashi, M.; Hossain, M. S. A.; Peleckis, G.
PUB. DATE
September 2012
SOURCE
Iranian Journal of Physics Research;Fall2012, Vol. 12 Issue 3, p43
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The flux-pinning mechanism and activation energy of 10 wt % malic acid-doped MgB2 were investigated by measuring of the critical current density and resistivity as a function of magnetic field and temperature. A crossover field, Bsb, was observed from the single vortex to the small vortex bundle pinning regime. For the sintered sample, the temperature dependence of Bsb (T) at low temperature is in good agreement with the δℓ pinning mechanism, i.e., pinning associated with charge-carrier mean free path fluctuation. The activation energy was decreased by increasing the magnetic field and increased by increasing sintering temperature.
ACCESSION #
85726241

 

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