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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
; | | Date: |
21 Mar 2003 | | Journal: | Appl. Phys. Lett. 83(13), 2626 (2003) | | Subject: | Superconductivity | cond-mat.supr-con | | 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. | | Source: | arXiv, cond-mat/0303446 | | Services: | Forum | Review | PDF | Favorites | |
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