Ac-magnetic susceptibility in the peak-effect region of Nb3Sn

O. Bossen, A. Schilling, N. Toyota

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We performed a systematic study of the ac magnetic-susceptibility on a Nb3Sn single crystal which displays a strong peak effect near the upper critical field Hc2. In external magnetic fields above μ0H ≈ 3 T, the peak effect manifests itself in a single, distinct peak in the real part X′(T) of the ac susceptibility as a function of temperature T, the size of which continuously increases with increasing magnetic field H. In the imaginary part X″(T) of the ac susceptibility, on the other hand, a single peak initially grows with increasing H up to a well-defined value, and then splits into two sharp peaks which separate when H is further increased. We explain this surprising behavior by a flux-creep model and taking into account the enhancement of the critical-current density in the peak-effect region near Tc in which Bean's critical-state model seems to apply. Outside this region, the crystal is clearly in a flux-creep regime with finite creep exponent n.

Original languageEnglish
Pages (from-to)133-137
Number of pages5
JournalPhysica C: Superconductivity and its applications
Publication statusPublished - 2013
Externally publishedYes


  • Ac magnetic susceptibility
  • Critical current
  • Magnetic properties
  • Peak effect
  • Vortex pinning

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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