Surface barrier and bulk pinning in MgB$_2$ superconductor

M. Pissas; E. Moraitakis; D. Stamopoulos; G. Papavassiliou; V. Psycharis; S. Koutandos

Surface barrier and bulk pinning in MgB$_2$ superconductor

Superconductivity 2007-05-23 v1 Materials Science

Authors: M. Pissas , E. Moraitakis , D. Stamopoulos , G. Papavassiliou , V. Psycharis , S. Koutandos

Abstract

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.

Keywords

MgB2 superconductor surface barrier bulk pinning magnetization loop magnetic relaxation

Cite

@article{arxiv.cond-mat/0108153,
  title  = {Surface barrier and bulk pinning in MgB$_2$ superconductor},
  author = {M. Pissas and E. Moraitakis and D. Stamopoulos and G. Papavassiliou and V. Psycharis and S. Koutandos},
  journal= {arXiv preprint arXiv:cond-mat/0108153},
  year   = {2007}
}

Comments

5 pages, 6 figures

Surface barrier and bulk pinning in MgB$_2$ superconductor

Abstract

Keywords

Cite

Comments

Related papers