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The crystal structure and superconductivity of MgB2 thin films grown on various oxide substrates were investigated by X-ray diffraction and resistance measurement. The films were prepared by a two-step method, in which precursors B films were annealed in Mg vapor at 900○C. The X-ray diffraction shows that the MgB2 films grown on C–AL2O3, R–AL2O3, and MgO (001) are c-axis oriented while the films grown...
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