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

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

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 journal › Article

Abstract

Instabilities of the critical state ("turbulence") are observed in various high-T_c 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-T_c 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 Dec 1

Keywords

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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Koblischka, M. R., Johansen, T. H., Baziljevich, M., & Murakami, M. (2002). SQUID and magneto-optic investigations of flux turbulence in the critical state. Journal of Superconductivity and Novel Magnetism, 15(2), 153-157.

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T1 - SQUID and magneto-optic investigations of flux turbulence in the critical state

AU - Koblischka, M. R.

AU - Johansen, T. H.

AU - Baziljevich, M.

AU - Murakami, M.

PY - 2002/12/1

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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.

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