CHARACTERISTICS OF MgB2 THIN FILMS SYNTHESIZED BY CO-EVAPORATION METHOD

Abstract

MgB 2 thin films have been synthesized by co -evaporation method by controlling the relative deposition rates of B and Mg on sapphire ( Al 2 O 3) substrate. Before the co -evaporation of Mg and B , the deposition rates of each element have been measured separately with various substrate temperatures. As the substrate temperature increased above the optimum growth condition, Mg started to evaporate from the already reacted MgB 2 and form MgB 12 as a second phase, which resulted in the tendency decreasing the critical temperature. Superconducting properties have been measured by PPMS and the microstructural features have been characterized with XRD, SEM and EDS.