Magnesium diboride (MgB2) thin films were deposited by a sputtering method onto c-axis oriented Al2O3 substrates at various deposition temperatures and followed by an in-situ annealing. A study was conducted on the effects of the various growth and annealing parameters on the physical properties of the MgB2 thin films. The substrate temperature was found to be the primary factor in determining the superconducting transitional temperature (Tc), while annealing plays a secondary role. Thin films deposited at substrate temperatures above 180°C lacked the superconducting transition due to the low magnesium sticking coefficient at elevated substrate temperatures. Low deposition temperatures did not produce stoichiometric MgB2 phase to experience transition. The three dimensional images of surface structures measured with the Atomic Force Microscope (AFM) showed higher Tc films displaying a smoother surface and well defined grains, while lower Tc samples lacked these well defined grains.
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 48/02M, Masters Abstracts International|
|Subjects:||Condensed matter physics|
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