Study on relation between AC characteristics and critical current distribution in YBCO tape

Osami Tsukamoto, Daisuke Miyagi

Research output: Contribution to journalConference articlepeer-review

17 Citations (Scopus)


We measured AC transport current loss of a high current density YBCO tape conductor. The tape conductor was made by depositing YBCO thin layer of approximately 1 μm thick on a LaAlO3 single crystal substrate and its critical current was around 100 A at 0 T and 77 K. The loss data deviated from the Norris curves for the elliptical and strip models. We made an analytical model to numerically calculate the AC transport current loss. In the model, critical current density (Jc) distribution in the wire cross section is taken into consideration. It is shown by the analysis based on the model that the deviation of the measured AC loss from the Norris equations is due to inhomogeneous Jc distribution in the cross section of the tape. The Jc distribution was investigated by subdividing the YBCO layer along the longitudinal direction. The results of the investigation are compared with the Jc distribution deduced from the analysis. The loss data showed frequency dependency, which can be explained by assuming that the loss has hysteretic and eddy-current-like loss components.

Original languageEnglish
Pages (from-to)1208-1211
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1
Publication statusPublished - 2000
Externally publishedYes
EventThe 16th International Conference on Magnet Tehnolopgy - Tallahassee, FL, USA
Duration: 1999 Sep 261999 Oct 2

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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