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Prominent bulk pinning effect in the MgB_2 superconductor | | Mun-Seog Kim
; C. U. Jung
; Min-Seok Park
; S. Y. Lee
; Kijoon H. P. Kim
; W N. Kang
; Sung-Ik Lee
; | | Date: |
19 Feb 2001 | | Journal: | Phys. Rev. B 64, 12511 (2001) | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | We report the magnetic-field dependence of the irreversible magnetization of the recently discovered binary superconductor MgB$_{2}$. For the temperature region of $T< 0.9T_c$, the contribution of the bulk pinning to the magnetization overwhelms that of the surface pinning. This was evident from the fact that the magnetization curves, $M(H)$, were well described by the critical-state model without considering the surface pinning effect. It was also found that the $M(H)$ curves at various temperatures scaled when the field and the magnetization were normalized by the characteristic scaling factors $H^ast(T)$ and $M^ast(T)$, respectively. This feature suggests that the pinning mechanism determining the hysteresis in $M(H)$ is unique below $T=T_c$. | | Source: | arXiv, cond-mat/0102338 | | Services: | Forum | Review | PDF | Favorites | |
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