Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
권호 표지
DOI QR코드

DOI QR Code

Significant enhancement of critical current density by effective carbon-doping in MgB2 thin films

  • Ranot, Mahipal (BK21 Physics Division and Department of Physics, Sungkyunkwan University) ;
  • Lee, O.Y. (BK21 Physics Division and Department of Physics, Sungkyunkwan University) ;
  • Kang, W.N. (BK21 Physics Division and Department of Physics, Sungkyunkwan University)
  • Received : 2013.06.04
  • Accepted : 2013.06.27
  • Published : 2013.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

The pure and carbon (C)-doped $MgB_2$ thin films were fabricated on $Al_2O_3$ (0001) substrates at a temperature of $650^{\circ}C$ by using hot-filament-assisted hybrid physical-chemical vapor deposition technique. The $T_c$ value for pure $MgB_2$ film is 38.5 K, while it is between 30 and 35 K for carbon-doped $MgB_2$ films. Expansion in c-axis lattice parameter was observed with increase in carbon doping concentration which is in contrast to carbon-doped $MgB_2$ single crystals. Significant enhancement in the critical current density was obtained for C-doped $MgB_2$ films as compared to the undoped $MgB_2$ film. This enhancement is most probably due to the incorporation of C into $MgB_2$ and the high density of grain boundaries, both help in the pinning of vortices and result in improved superconducting performance.

Keywords

References

  1. W. N. Kang, H. J. Kim, E. M. Choi, C. U. Jung and S. I. Lee, "$MgB_2$ superconducting thin films with a transition temperature of 39 Kelvin," Science, vol. 292, pp. 1521, 2001. https://doi.org/10.1126/science.1060822
  2. D. Larbalestier, A. Gurevich, D. M. Feldmann, A. Polyanskii, "High-Tc superconducting materials for electric power applications," Nature (London), vol. 414, pp. 368, 2001. https://doi.org/10.1038/35104654
  3. Mahipal Ranot and W. N. Kang,"$MgB_2$ coated superconducting tapes with high critical current densities fabricated by hybrid physical-chemical vapor deposition," Curr. Appl. Phys., vol. 12, pp. 353, 2012. https://doi.org/10.1016/j.cap.2011.09.003
  4. J. H. Kim et al., "Microscopic role of carbon on $MgB_2$ wire for critical current density comparable to NbTi," NPG Asia Mater., vol. 4, pp. e3, 2012. https://doi.org/10.1038/am.2012.3
  5. X. X. Xi,"$MgB_2$ thin films," Supercond. Sci. Technol., vol. 22, pp. 043001, 2009. https://doi.org/10.1088/0953-2048/22/4/043001
  6. C. G. Zhuang et al., "Significant improvements of the high-field properties of carbon-doped $MgB_2$ films by hot-filament-assisted hybrid physical-chemical vapor deposition using methane as the doping source," Supercond. Sci. Technol., vol. 21, pp. 082002, 2008. https://doi.org/10.1088/0953-2048/21/8/082002
  7. M. Ranot, W. K. Seong, Soon-Gil Jung, W. N. Kang, J. Joo, C-J Kim, B-H Jun, S Oh, "Effect of SiC-impurity layer and growth temperature on $MgB_2$ superconducting tapes fabricated by HPCVD," Chem.Vapor. Depos., vol. 18, pp. 36, 2012. https://doi.org/10.1002/cvde.201106935
  8. S. M. Kazakov et al., "Carbon substitution in $MgB_2$ single crystals: structural and superconducting properties," Phys. Rev. B, vol. 71, pp. 024533, 2005. https://doi.org/10.1103/PhysRevB.71.024533

Cited by

  1. A review on the understanding and fabrication advancement of MgB2thin and thick films by HPCVD vol.17, pp.2, 2015, https://doi.org/10.9714/psac.2015.17.2.001
  2. A safe and cost-effective PMMA carbon source for MgB2 vol.19, pp.1, 2017, https://doi.org/10.9714/psac.2017.19.1.047
  3. Carbon-coated boron using low-cost naphthalene for substantial enhancement of Jc in MgB2 superconductor vol.19, pp.3, 2013, https://doi.org/10.9714/psac.2017.19.3.040