Electron scattering dependence of dendritic magnetic instability in superconducting MgB2 films

Details Electron scattering dependence of dendritic magnetic instability in superconducting MgB2 films Electron scattering dependence of dendritic magnetic instability in superconducting MgB2 films

2004-10-13

arxiv.org/abs/cond-mat/0410342v1

Applied Physics Letters, Vol. 85, 5284 (2004)

Physics

Condensed Matter

Superconductivity

14 pages, 4 figures

Scientific paper

10.1063/1.1827931

Magnetic instability in both ultra-pure and carbon-doped MgB2 films is investigated by magneto-optical imaging, transport and bulk magnetization measurements. In the carbon-doped MgB2 thin film, familiar dendritic flux-jump patterns were observed at low temperature as reported in previous experiments. In the ultra-pure MgB2 thin film, however, a remarkably stable flux penetration was observed, clearly showing the classic behavior of the critical state model. Such different behavior indicates that the electron scattering ultimately controls the magnetic stability of MgB2 films.

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