Prominent bulk pinning effect in the MgB_2 superconductor

Details Prominent bulk pinning effect in the MgB_2 superconductor Prominent bulk pinning effect in the MgB_2 superconductor

2001-02-19

arxiv.org/abs/cond-mat/0102338v4

Phys. Rev. B 64, 12511 (2001)

Physics

Condensed Matter

Superconductivity

4pages and 4 figures. Phys. Rev. B (accepted)

Scientific paper

10.1103/PhysRevB.64.012511

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 $T=T_c$.

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