Measurement of critical current for bulk superconductors by transport method

T. S. Kikegawa, H. Sasaki, H. Tada, T. Kudo, H. Kikuchi, K. Konno, Muralidhar Miryala, Masato Murakami, K. Noto, S. Awaji, K. Watanabe

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Abstract

The method of critical current measurement in a magnetic field using a DC transport current has been developed for bulk superconductors. The measurement of the critical current, Ic, up to 50 A at a temperature of 77 K became possible by reducing thermal and mechanical stresses caused in the sample due to rapid cooling from the room temperature to 77 K and a electromagnetic force (Lorentz force), etc. The critical current of 50 A is reduced into 14,000 A/cm2 of critical current density, Jc, with a cross section of 0.0035 cm2. The magnetic field dependence of Jc was investigated from 1 T to 10 T for (Nd0.33Eu 0.38Gd0.28)Ba2Cu3Oy bulk superconductors. The magnetization measurement was performed for the sample cut out from the same part of the same crystal as that used for the transport measurement of Ic, from which the critical current density was also estimated. In low magnetic fields, the magnitude of critical current density obtained by the transport method, JcT, was larger than that estimated from the magnetization, JcM. This result reflects the difference of criterion to determine the value of JcT and JcM. In higher magnetic fields, however, it was observed that JcT was smaller than JcM and the irreversibility field estimated from JcT-B curve is slightly lower than that given by the magnetic hysteresis. When the external magnetic field was applied, anomalous voltage peaks in the I-V curve were observed below IcT, which may be caused by the sample slightly moving by the Lorentz force.

Original languageEnglish
Pages (from-to)649-653
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume426-431
Issue numberI
DOIs
Publication statusPublished - 2005 Oct 1
Externally publishedYes

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Keywords

  • (Nd-Eu-Gd)BaCuO
  • Bulk superconductor
  • Magnetic field dependence
  • Method of measurement
  • Transport critical current

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Kikegawa, T. S., Sasaki, H., Tada, H., Kudo, T., Kikuchi, H., Konno, K., ... Watanabe, K. (2005). Measurement of critical current for bulk superconductors by transport method. Physica C: Superconductivity and its Applications, 426-431(I), 649-653. https://doi.org/10.1016/j.physc.2005.02.099