Multi-stable static states of Bi-based superconducting composites and current instabilities at various operating temperatures

V. R. Romanovskii, K. Watanabe

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Static thermal and electric states before current instability in the current-carrying conductor like Bi-based superconducting composite are theoretically studied under the assumption that the critical current density of a superconductor and matrix resistivity are the non-linear functions of the temperature at fixed applied magnetic field. The simulation was made for the conduction-cooling conditions at different operating temperatures. The proposed analysis was based on the investigation of the non-isothermal voltage-current characteristics of composite superconductors. It is shown that they may have many-valued stable and unstable branches appearing in accordance with the non-trivial variation of the differential resistivity with increasing temperature. These states, first of all, are due to the temperature change of ∂Jc/∂T and are accompanied with the jump-like current-sharing mechanism. The parameters of the current instability onset as a function of operating temperature are numerically derived accounting for the additional stable branches of the voltage-current characteristics. In particular, it is revealed the existence of the static states when Bi-based composite superconductors may have a stable current distribution in the temperature range increasing up to the critical temperature of a superconductor without redistribution of all transport current into the matrix. The peculiarities of these phenomena are discussed.

Original languageEnglish
Pages (from-to)99-110
Number of pages12
JournalPhysica C: Superconductivity and its applications
Issue number3-4
Publication statusPublished - 2005 Apr 1

ASJC Scopus subject areas

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


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