Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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A study on inhomogeneity of YBCO Coated Conductors using Low-temperature Scanning Laser Microscopy (LTSLM)

저온 주사 레이저 현미경(LTSLM)을 이용한 YBCO 초전도 선재의 불균질성 연구

  • Park, S.K. (Department of Physics, Kyungpook National University) ;
  • Kim, J.M. (Department of Physics, Kyungpook National University) ;
  • Lee, S.B. (Department of Physics, Kyungpook National University) ;
  • Kim, S.H. (Department of Physics, Kyungpook National University) ;
  • Kim, G.Y. (Department of Physics, Kyungpook National University) ;
  • Ri, H.C. (Department of Physics, Kyungpook National University)
  • Published : 2009.10.30
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Abstract

Low temperature scanning laser microscopy (LTSLM) can be used for a two-dimensional display of bolometric response arising from the localized excitation of a sample by the focused laser beam. In this study, the distribution of critical temperature ($T_c$) and critical current density ($J_c$) in YBCO coated conductor were analyzed using LTSLM. For improving the temperature stability, we have modified the system into a double-shielding type. Through the modification, the temperature stability was successfully improved from ${\pm}10mK\;to\;{\pm}2mK$. The superconducting properties of YBCO coated conductors were measured for the sample of a narrow bridge type using wet etching process. The spatial non-uniformity of the ac voltage response, ${\delta}V(x)$, which is proportional to ${\partial}\rho(x,J_B)/{\partial}T$ in the transition temperature region could be observed and displayed in a two-dimensional image.

Keywords

References

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