Abstract
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 language | English |
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Pages (from-to) | 153-157 |
Number of pages | 5 |
Journal | Journal of Superconductivity and Novel Magnetism |
Volume | 15 |
Issue number | 2 |
Publication status | Published - 2002 |
Externally published | Yes |
Keywords
- Critical state
- Flux turbulence
- Instability
- Magnetization measurements
- Magneto-optics
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics