Physics – Condensed Matter – Superconductivity
Scientific paper
2003-03-21
Appl. Phys. Lett. 83(13), 2626 (2003)
Physics
Condensed Matter
Superconductivity
Typo corrected & reference added
Scientific paper
10.1063/1.1613035
Magnetic relaxation of high-pressure synthesized MgB$_2$ bulks with different thickness is investigated. It is found that the superconducting dia-magnetic moment depends on time in a logarithmic way; the flux-creep activation energy decreases linearly with the current density (as expected by Kim-Anderson model); and the activation energy increases linearly with the thickness of sample when it is thinner than about 1 mm. These features suggest that the vortices in the MgB$_2$ are rather rigid, and the pinning and creep can be well described by Kim-Anderson model.
Che Guang-Can
Jin Hao
Liu Zhi-Yong
Ren Z.-A.
Wen Hai-hu
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