High critical current densities in superconducting MgB2 thin films

Details High critical current densities in superconducting MgB2 thin films High critical current densities in superconducting MgB2 thin films

2001-04-12

arxiv.org/abs/cond-mat/0104230v1

Physics

Condensed Matter

Superconductivity

13 pages, 4 figures, submitted on Apr. 4, 2001, only one pdf file

Scientific paper

10.1063/1.1407854

Superconducting MgB2 thin films were prepared on Al2O3(0001) and MgO(100) substrates. Boron thin films were deposited by the electron-beam evaporation followed by post-annealing process with magnesium. Proper post annealing conditions were investigated to grow good superconducting MgB2 thin films. The X-ray diffraction patterns showed randomly orientated growth of MgB2 phase in our thin films. The surface morphology was examined by scanning electron microscope (SEM) and atomic force microscope (AFM). Critical current density (Jc) measured by transport method was about 10^7 A/cm^2 at 15 K, and superconducting transition temperature (Tc) was ~ 39 K in the MgB2 thin films on Al2O3.

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