Synthesis of as-grown superconducting MgB2 thin films by molecular beam epitaxy in UHV conditions
Abstract
As-grown superconducting MgB2 thin films have been grown on SrTiO3(001), MgO(001), and Al2O3(0001) substrates by a molecular beam epitaxy (MBE) method with novel co-evaporation conditions of low deposition rate in ultra-high vacuum. The structural and physical properties of the films were studied by RHEED, XRD, electrical resistivity measurements, and SQUID magnetometer. The RHEED patterns indicate three-dimensional growth for MgB2. The highest Tc determined by resistivity measurement was about 36K in these samples. And a clear Meissner effect below Tc was observed using magnetic susceptibility measurement. We will discuss the influence of B buffer layer on the structural and physical properties.
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