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

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

2004-04-18

arxiv.org/abs/cond-mat/0404415v1

Physics

Condensed Matter

Superconductivity

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

Scientific paper

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.

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