Weak links and phase slip centers in superconducting MgB2 wires

Maya Bar-Sadan; Gregory Leitus; Shimon Reich

doi:10.1023/B:JOSC.0000041786.14341.a1

Weak links and phase slip centers in superconducting MgB2 wires

Superconductivity 2009-11-10 v1 Materials Science

Authors: Maya Bar-Sadan , Gregory Leitus , Shimon Reich

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Abstract

MgB2 superconducting wires were produced by the Mg diffusion method. Scanning electron microscopy (SEM), optical microscopy, dispersive x-ray analysis (EDS) and XRD diffraction were used to study the physical structure and content of the wires. Magnetic properties (Tcm, Hc1, Hc2, Jc by the Bean model) were obtained with a SQUID magnetometer, and transport properties (Tcr, Hc2, resistivity and residual resistivity ratio) were measured using a standard four-lead configuration. The V-I characteristics of the wires close to the critical temperature showed a staircase response, which was attributed to the presence of weak links, creating phase slip centers. The origin of those weak links is discussed in relation to their formation and structure.

Keywords

MgB2 superconducting wires weak links phase slip centers V-I characteristics critical temperature Mg diffusion method transport properties

Cite

@article{arxiv.cond-mat/0405219,
  title  = {Weak links and phase slip centers in superconducting MgB2 wires},
  author = {Maya Bar-Sadan and Gregory Leitus and Shimon Reich},
  journal= {arXiv preprint arXiv:cond-mat/0405219},
  year   = {2009}
}

Comments

7 pages, 7 figures, accepted to Journal of Superconductivity

Weak links and phase slip centers in superconducting MgB2 wires

Abstract

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