Surface barrier and bulk pinning in MgB$_2$ superconductor

Details Surface barrier and bulk pinning in MgB$_2$ superconductor Surface barrier and bulk pinning in MgB$_2$ superconductor

2001-08-09

arxiv.org/abs/cond-mat/0108153v1

Physics

Condensed Matter

Superconductivity

5 pages, 6 figures

Scientific paper

We present a modified method of preparation of the new superconductor MgB$_2$. The polycrystalline samples were characterized using x-ray and magnetic measurements. The surface barriers control the isothermal magnetization loops in powder samples. In bulk as prepared samples we always observed symmetric magnetization loops indicative of the presence of a bulk pinning mechanism. Magnetic relaxation measurements in the bulk sample reveal a crossover of surface barrier to bulk pinning.

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