Anisotropy of superconductivity of as-grown MgB${}_2$ thin films by molecular beam epitaxy

Abstract

Superconducting thin films of magnesium diboride (MgB${}_2$) were prepared on MgO (001) substrate by a molecular beam epitaxy (MBE) method with the co-evaporation conditions of low deposition rate in ultra-high vacuum. The structural and physical properties of the films were studied by RHEED, XRD, XPS, resistivity and magnetization measurements.All films demonstrated superconductivity without use of any post-annealing process.The highest {\it T}${}_{c,onset}$ determined by resistivity measurement was about 33K in the present samples.Anisotropic superconducting properties were evaluated by the resistivity and magnetic measurements.We will discuss the anisotropy of superconductivity for as-grown MgB${}_2$ thin films.

15 pages, 8 figures, 1 table, submitted to Journal of Applied Physics