Growth of Epitaxial MgB2 Thick Films with Columnar Structures by Using HPCVD

Won Kyung Seong; Ji Yeong Huh; Won Nam Kang; Jeong-Woon Kim; Yong-Seung Kwon; Nam-Keun Yang; Je-Geun Park

Growth of Epitaxial MgB2 Thick Films with Columnar Structures by Using HPCVD

Superconductivity 2007-09-13 v1

Authors: Won Kyung Seong , Ji Yeong Huh , Won Nam Kang , Jeong-Woon Kim , Yong-Seung Kwon , Nam-Keun Yang , Je-Geun Park

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Abstract

Epitaxial MgB2 thick films were grown on Al2O3 substrates at 600 oC by using the hybrid physical chemical vapor deposition (HPCVD) technique. In order to obtain a high magnesium vapor pressure around the substrates, we used a special susceptor having a susceptor cap and achieved a very high growth rate of 0.17 um/min. Hexgonal-shaped columnar structures were observed by cross-sectional and planar view transmission electron microscope (TEM) images. For the 1.7-um-thick film, the Tc was observed to be 40.5 K with a Jc of 1.5 x 10^6 A/cm^2 at 30 K. The vortex pinning mechanism by intercolumnar boundaries will be discussed.

Keywords

epitaxial thin films thin films thin film physics

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@article{arxiv.0709.1884,
  title  = {Growth of Epitaxial MgB2 Thick Films with Columnar Structures by Using HPCVD},
  author = {Won Kyung Seong and Ji Yeong Huh and Won Nam Kang and Jeong-Woon Kim and Yong-Seung Kwon and Nam-Keun Yang and Je-Geun Park},
  journal= {arXiv preprint arXiv:0709.1884},
  year   = {2007}
}

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10 pages including 6 figures

Growth of Epitaxial MgB2 Thick Films with Columnar Structures by Using HPCVD

Abstract

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