Physics – Condensed Matter – Superconductivity
Scientific paper
2004-01-28
Physics
Condensed Matter
Superconductivity
11 pages, 6 figures, submitted to Appl. Phys. Lett
Scientific paper
10.1063/1.1794357
We introduce a simple method of an MgB2 film preparation using sequential electron-beam evaporation of B-Mg two-layer (followed by in-situ annealing) on the NbN buffered Si(100) substrate. The Transmission Electron Microscopy analyses confirm a growth of homogeneous nanogranular MgB2 films without the presence of crystalline MgO. A sensitive measurement of temperature dependence of microwave losses shows a presence of intergranular weak links close the superconducting transition only. The MgB2 films obtained, about 200 nm thick, exhibit a maximum zero resistance critical temperature of 36 K and critical current density of 3x10^7 A/cm^2 at 13.2 K
Benacka S.
Chromik Stefan
der Beek Cornelis J. van
Gazi S.
Gierlowski Piotr
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