Journal
PHYSICAL REVIEW B
Volume 78, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.184502
Keywords
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Funding
- Australian Research Council
- Superconductivity Center of Sogang University
- MOST
- KOSEF
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Flux-pinning mechanism of MgB2 doped with 10 wt % silicone-oil sintered at low and high temperatures has been investigated by magnetic measurements. The field dependence of the critical current density, j(c)(B), was analyzed within the collective pinning model. A crossover field, B-sb, from the single vortex to the small vortex bundle-pinning regime was observed. For both types of sintered samples, the temperature dependence of B-sb(T) at low temperature is in good agreement with the delta l pinning mechanism, i.e., pinning associated with charge-carrier mean free path fluctuation. At temperatures close to the critical temperature, however, there is evidence for delta T-c pinning, which is associated with spatial fluctuations of the transition temperature. These results provide strong evidence that the liquid precursor, silicone oil, produces very small pinning centers and enhances the j(c)(B).
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