Critical state instability in Nb-clad MgB2 superconducting wires

V. Beilin, I. Felner, M. I. Tsindlekht, E. Dul'kin, E. Mojaev*, M. Roth

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Magnetization hysteresis loops of Cu/MgB2, Nb/MgB2, Cu/Nb/MgB2 and Fe/Cu/MgB2 wires in parallel magnetic fields of up to 5 T were studied in the temperature range from 5 to 35 K. All Nb-clad samples exhibited a thermomagnetic instability (TMI) in the form of magnetization jumps. In a thick wire (about 2 mm in core diameter), the TMI persisted up to the unexpectedly high temperature of 32 K. Thin wires showed low TMI which vanished at T > 10 K. Cu/MgB2 wires which did not contain a Nb barrier, showed no signs of TMI. The TMI in thin wires exhibited good reproducibility and stability in the jump pattern (JP) (jump amplitudes and positions), while thick wires showed the worst time stability. We found that moderate flat rolling of the round unstable Cu/Nb/MgB2 wire resulted in negligible TMI at 5 K in the processed flat tape. The TMI amplitudes of studied samples correlated with the adiabatic stability parameter, β-1.

Original languageAmerican English
Pages (from-to)223-228
Number of pages6
JournalPhysica C: Superconductivity and its Applications
Issue number3
StatePublished - 1 Feb 2008

Bibliographical note

Funding Information:
This research was supported in part by the Israel Science Foundation (ISF, 2004 Grant number: 618/04), by the Klachky Foundation for Superconductivity and by the Ministry of the National Infrastructures of Israel.


  • Critical current
  • Magnetic properties
  • MgB
  • Mixed state


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