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Measurement of Critical Current Density in Bulk Superconductors Based on Small Point Contact Characterization

Hosseini, N ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1007/s10948-012-2023-1
  3. Publisher: 2013
  4. Abstract:
  5. A new approach to measure the critical current density of bulk superconductors is presented in this paper. In the proposed technique, the characterization uses a pulsed current which passes through a small point contact at the middle of the bulk and distributes uniformly, while the other contact is a copper ring around the bulk. By increasing the pulsed current above a threshold current, a normal zone appears and develops into a semi-oblate spheroid forming around the contact point. By analyzing its size and shape, and electromagnetic fundamentals, the voltage-current relationship in the normal zone is obtainable. In addition, experimental works have been performed and the results are in agreement with the theoretical analysis. In this characterization method, the obtained voltage-current relationship and the acquired experimental results lead to the critical current density measurement in the bulk superconductor pellet
  6. Keywords:
  7. Bulk superconductor ; Characterization ; Critical current density ; Normal zone
  8. Source: Journal of Superconductivity and Novel Magnetism ; 2013 , Pages 1-4 ; 15571939 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs10948-012-2023-1