论文信息 - High critical current densities in superconducting MgB2 thin films

High critical current densities in superconducting MgB2 thin films

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 postannealing process with magnesium. Proper postannealing conditions were investigated to grow good superconducting MgB2 thin films. The x-ray diffraction patterns showed randomly oriented growth of MgB2 phase in our thin films. The surface morphology was examined by scanning electron microscope and atomic force microscope. Critical current density (JC) measured by transport method was about 107 A/cm2 at 15 K, and superconducting transition temperature (TC) was ∼39 K in the MgB2 thin films on Al2O3.

[1] Jh H. Choi,et al. High critical current density and enhanced irreversibility ® eld in superconducting MgB 2 thin ® lms , 2001 .

[2] D. Christen,et al. Superconducting magnesium diboride films with Tc≈24 K grown by pulsed laser deposition with in situ anneal , 2001, cond-mat/0103478.

[3] Sung-Ik Lee,et al. MgB2 Superconducting Thin Films with a Transition Temperature of 39 Kelvin , 2001, Science.

[4] J. Nagamatsu,et al. Superconductivity at 39 K in magnesium diboride , 2001, Nature.

[5] P. Canfield,et al. Superconductivity in dense MgB2 wires. , 2001, Physical review letters.

[6] R. Cava,et al. Strongly linked current flow in polycrystalline forms of the superconductor MgB2 , 2001, Nature.

[7] P. Canfield,et al. Boron isotope effect in superconducting MgB2. , 2001, Physical review letters.