Current percolation and anisotropy in polycrystalline MgB$_2$

Details Current percolation and anisotropy in polycrystalline MgB$_2$ Current percolation and anisotropy in polycrystalline MgB$_2$

2003-05-08

arxiv.org/abs/cond-mat/0305168v1

Phys. Rev. Lett. 90 (2003) 247002

Physics

Condensed Matter

Superconductivity

5 pages, accepted for publication in Physical Review Letters (http://prl.aps.org/)

Scientific paper

10.1103/PhysRevLett.90.247002

The influence of anisotropy on the transport current in MgB$_2$ polycrystalline bulk samples and wires is discussed. A model for the critical current density is proposed, which is based on anisotropic London theory, grain boundary pinning and percolation theory. The calculated currents agree convincingly with experimental data and the fit parameters, especially the anisotropy, obtained from percolation theory agree with experiment or theoretical predictions.

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