Electron scattering dependence of dendritic magnetic instability in superconducting MgB2 films

Abstract

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.

14 pages, 4 figures

References in corpus (10)

• Enhancement of the upper critical field by nonmagnetic impurities in dirty two-gap superconductors
• In situ epitaxial MgB2 thin films for superconducting electronics
• Two-Band Superconductivity in MgB2
• High current-carrying capability in c-axis-oriented superconducting MgB2 thin films
• Dendritic magnetic instability in superconducting MgB2 films
• Carbon doping of superconducting magnesium diboride
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• Properties of MgB2 thin films with carbon doping
• Suppression of Superconducting Critical Current Density by Small Flux Jumps in $Mg{B}_2$ Thin Films
• Vortex avalanches and magnetic flux fragmentation in superconductors

Cited by in corpus (5)

• The Dendritic magnetic avalanches in carbon-free MgB${}_2$ thin films with and without a deposited Au layer
• Nucleation and propagation of thermomagnetic avalanches in thin-film superconductors
• Flux Dendrites of Opposite Polarity in Superconducting MgB${}_2$ rings observed with magneto-optical imaging
• Diversity of flux avalanche patterns in superconducting films
• Roles of intrinsic anisotropy and pi-band pairbreaking effects on critical currents in tilted c-axis MgB2 films probed by magneto-optical and transport measurements