Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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Standardization of the Critical Temperature Measurement by Using an AC Susceptometer

  • Lee, K. W. (Korea Research Institute of Standards and Science) ;
  • Kim, M. S. (Korea Research Institute of Standards and Science) ;
  • Kim, K. (Korea Research Institute of Standards and Science) ;
  • Kim, D. H. (Yeungnam University) ;
  • Lee, S. G. (Korean Agency for Technology and Standards)
  • Published : 2005.10.01
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Abstract

We have studied the standardization of critical temperature measurements by using an ac susceptometer. Wire forms of NbTi, $Nb_{3}Sn$, and Bi-2223 superconductors were prepared to measure the temperature dependences of the magnetization. In order to study the optimum ac magnetic field and frequency, various amplitudes from 2 Oe to 10 Oe with frequencies from 11.3 Hz to 1033 Hz were applied to three specimens. Analytical comparison of the magnetic curves with the resistive curves was accomplished to investigate validity of using the new method.

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