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 |
|---|---|
| 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 |
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Keywords
- Critical state
- Flux turbulence
- Instability
- Magnetization measurements
- Magneto-optics
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Physics and Astronomy (miscellaneous)
Cite this
SQUID and magneto-optic investigations of flux turbulence in the critical state. / Koblischka, Michael Rudolf; Johansen, T. H.; Baziljevich, M.; Murakami, Masato.
In: Journal of Superconductivity and Novel Magnetism, Vol. 15, No. 2, 2002, p. 153-157.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - SQUID and magneto-optic investigations of flux turbulence in the critical state
AU - Koblischka, Michael Rudolf
AU - Johansen, T. H.
AU - Baziljevich, M.
AU - Murakami, Masato
PY - 2002
Y1 - 2002
N2 - 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.
AB - 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.
KW - Critical state
KW - Flux turbulence
KW - Instability
KW - Magnetization measurements
KW - Magneto-optics
UR - http://www.scopus.com/inward/record.url?scp=10144237907&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=10144237907&partnerID=8YFLogxK
M3 - Article
VL - 15
SP - 153
EP - 157
JO - Journal of Superconductivity and Novel Magnetism
JF - Journal of Superconductivity and Novel Magnetism
SN - 1557-1939
IS - 2
ER -