SQUID and magneto-optic investigations of flux turbulence

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

Research output: Contribution to journalArticlepeer-review


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 for the first time characteristic steps in the magnetic moment measured by means of a SQUID system, which allows a continuous temperature sweep. A direct correlation between the steps and the MO images is established. Using this 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. Furthermore, we present tests for turbulence in several different high-Tc samples.

Original languageEnglish
Pages (from-to)1275-1276
Number of pages2
JournalPhysica C: Superconductivity and its applications
Issue numberPART 3
Publication statusPublished - 2000
Externally publishedYes

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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