Preparation and Properties of MgB 2 Thin Films
作者： Anton V. Shaternik , Tatiana A. Prikhna , Vladimir Sokolovsky , Viktor E. Moshchil , Vitaliy V. Romaka
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摘要: The superconducting transition temperature of 140 nm ± 10 nm thin films on sapphire substrates, which were deposited by magnetron sputtering, was around 36 K. Using a magnetization technique, the film's critical current density estimated as J C = 1.8 × 107 А/cm2 at 10 K, 8 106 А/m 2 20 K in zero magnetic field B, and 3 А/m2 10 K B 5 T. values upper c2 irreversibility irr using four-probe technique C2(22 K) 15 T when H||film surface, 11 H⊥film irr(22 K) surface. X-ray study showed that microstructure film contains only MgB2 MgO (in minority). SEM EPXMA quantitative Auger spectroscopy analysis revealed periodical variations composition nanolevel presence (mainly) two intercalated Mg-B-O-C phases slightly different, especially oxygen content, thus with different conductivity and, possibly, C. characteristics magnesium diboride make them promising for application electronic devices, e.g., high-pass filters.
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