SQUID and magneto-optic investigations of flux turbulence in the critical state

M. R. Koblischka, T. H. Johansen, M. Baziljevich, M. Murakami

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Instabilities of the critical state ("turbulence") are observed in various high-Tc single crystals by means of magneto-optic (MO) imaging. Using the same samples as in the MO investigations, we observe characteristic steps in the magnetic moment measured by means of a SQUID magnetometer, which allows a continuous temperature sweep. A direct correlation between the steps and the MO images is established. Using these SQUID measurements, a much wider range of field and temperature can be covered. As a result, we find turbulence not only in a narrow temperature window but also in a field window ranging between 0 and 80 mT. Flux turbulence is also observed in magnetization loops. Furthermore, we present tests for turbulence in several different high-Tc samples.

Original languageEnglish
Pages (from-to)153-157
Number of pages5
JournalJournal of Superconductivity and Novel Magnetism
Issue number2
Publication statusPublished - 2002
Externally publishedYes


  • Critical state
  • Flux turbulence
  • Instability
  • Magnetization measurements
  • Magneto-optics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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