Effect of sample size on the magnetic critical current density in nano-SiC doped MgB2 superconductors
S. Soltanian, M. J. Qin, S. Keshavarzi, X. L. Wang, S. X. Dou
DOI 10.1103/PhysRevB.68.134509 · Physical Review B
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Abstract
The effect of sample size on the critical current density and the flux pinning of pure and SiC doped MgB2 bulk samples has been investigated. At high fields a systematic degradation of magnetic Jc and Hirr was observed as the sample size decreased. However, Jc remarkably increased on decreasing the sample volume at low magnetic fields below 1 T. The SiC doped samples show less sample size effect than the pure samples, indicating a larger n factor and therefore a stronger pinning effect due to SiC doping. Hirr was observed to decrease as a logarithmic function of the sample volume, and the zero field Jc can be fitted as an exponential decay function.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.6 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.05 | Pressure not reported | unknown |
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