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Fulx-pinning mechanism and activation energy in malic acid-doped MgB2

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Author(s): SR Ghorbani | M Bashi | A Broghani

Journal: Iranian Journal of Physics Research
ISSN 1682-6957

Volume: 10;
Issue: 2;
Start page: 107;
Date: 2010;
Original page

Keywords: critical current density; fulx-pinning mechanism; activation energy superconductor MgB2

ABSTRACT
Fulx-pinning mechanism and activation energy of MgB2 doped with 10 wt % malic- acid has been investigated by measurement of critical current density and resistivity as a function of magnetic fields and temperatures. The field dependence of the critical current density, Jc(B), was analyzed within the collective pinning model. A crossover field, Bsb, from the single vortex to the small vortex bundle-pinning regime was observed. For 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 linearly by increasing magnetic field.
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