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

Michael Rudolf Koblischka; T. H. Johansen; M. Baziljevich; Masato Murakami

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

Michael Rudolf Koblischka, T. H. Johansen, M. Baziljevich, Masato 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
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

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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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.",

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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

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

Abstract

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Keywords

ASJC Scopus subject areas

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