Physics – Condensed Matter – Superconductivity
Scientific paper
2004-10-13
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.
Cui Yi
Hu Yue-Feng
Li Qian
Li Qiang
Pogrebnyakov A. V.
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