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 › peer-review

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

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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@article{06d92e48d970432383eaa895a87f439a,

title = "SQUID and magneto-optic investigations of flux turbulence in the critical state",

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.",

keywords = "Critical state, Flux turbulence, Instability, Magnetization measurements, Magneto-optics",

author = "Koblischka, {M. R.} and Johansen, {T. H.} and M. Baziljevich and M. Murakami",

note = "Funding Information: The authors thank Th. Wolf (Karlsruhe) and A. A. Menovsky (Amsterdam) for the crystals used in this study. This work is partially supported by NEDO; the Danish Technical Research Council and the Research Council of Norway. M.R.K. acknowledges support from STA during the stay at SRL/ISTEC, where the SQUID measurements and a part of the MO experiments were performed.",

year = "2002",

language = "English",

volume = "15",

pages = "153--157",

journal = "Journal of Superconductivity and Novel Magnetism",

issn = "1557-1939",

publisher = "Springer New York",

number = "2",

}

TY - JOUR

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.

N1 - Funding Information: The authors thank Th. Wolf (Karlsruhe) and A. A. Menovsky (Amsterdam) for the crystals used in this study. This work is partially supported by NEDO; the Danish Technical Research Council and the Research Council of Norway. M.R.K. acknowledges support from STA during the stay at SRL/ISTEC, where the SQUID measurements and a part of the MO experiments were performed.

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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M3 - Article

AN - SCOPUS:10144237907

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 -