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Surface barrier and bulk pinning in MgB2 superconductor

2001/08/09 by M. Pissas, Pissas, M., E. Moraitakis +9
Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Superconductivity (cond-mat.supr-con) #cond-mat.mtrl-sci #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.cond-mat/0108153

5 pages, 6 figures

arxiv created 2001/08/09 · arxiv updated 2009/11/30

Abstract

We present a modified method of preparation of the new superconductor MgB2. 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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