Superconductivity of epitaxial MgB2 thick films and MgB2 nanowires grown by hybrid physical-chemical vapor deposition

  • Seong W
  • Kang W
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Abstract

We have fabricated epitaxial MgB2 thick films and MgB2 nanowires by using hybrid physical-chemical vapor deposition (HPCVD) technique. Mg pellet and B2H6 gas were used as source substances. We used a special susceptor with a susceptor cap in order to obtain a high magnesium vapor pressure around the substrate. We were able to achieve very high growth rate of 0.17 ??m/min. MgB2 thick films and MgB2 nanowires were grown on Al2O3 substrates at a low temperature. X-ray diffraction patterns showed epitaxial growth of MgB2 thick films. Columnar structures of epitaxial MgB2 thick films were observed by cross-sectional view transmission electron microscope (TEM) images. For the 1.7 ??m thick film, the Tc was observed to be 40.5 K with a Jc of 1.5 ?? 106 A/cm2 at 30 K. The MgB2 nanowire observed by using scanning electron microscope (SEM) was 70-100 nm in diameter and 1-3 ??m in length. A focused ion beam (FIB) was used to fabricate MgB2 nano-bridge pattern on the MgB2 thin film. The superconductivity of the MgB2 nanowire was confirmed by using resistivity measurements. ?? 2008 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • HPCVD
  • MgB2
  • Nanowire
  • Superconducting thick film

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Authors

  • W. K. Seong

  • W. N. Kang

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