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Rigid vortices in MgB2

Hao Jin·Hai-Hu Wen·Hai-Peng Yang·Zhi-Yong Liu·Zhi-An Ren·Guang-Can Che·Zhong-Xian Zhao
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Abstract

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.

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Hao Jin, Hai-Hu Wen, Hai-Peng Yang, Zhi-Yong Liu, Zhi-An Ren, Guang-Can Che, Zhong-Xian Zhao. 2003-10-01. Rigid vortices in MgB2. https://doi.org/10.1063/1.1613035

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