%0 Journal Article
%T Prominent bulk pinning effect in the MgB_2 superconductor
%A Mun-Seog Kim
%A C. U. Jung
%A Min-Seok Park
%A S. Y. Lee
%A Kijoon H. P. Kim
%A W N. Kang
%A Sung-Ik Lee
%J Physics
%D 2001
%I arXiv
%R 10.1103/PhysRevB.64.012511
%X 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 $T=T_c$.
%U http://arxiv.org/abs/cond-mat/0102338v4