Instability of the Critical State in NdBa2Cu3O7-δ Single Crystals

Michael R. Koblischka; Masato Murakami; Satoru Koishikawa; Tom Henning Johansen; Michael Baziljevich; Thomas Frello; Thomas Wolf

doi:10.1023/a:1022518406132

Instability of the Critical State in NdBa₂Cu₃O_7-δ Single Crystals

Michael R. Koblischka, Masato Murakami, Satoru Koishikawa, Tom Henning Johansen, Michael Baziljevich, Thomas Frello, Thomas Wolf

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Instabilities of the critical state are observed in various NdBa₂Cu₃O_7-δ single crystals by means of direct magneto-optic (MO) imaging while warming up flux states containing vortices of opposite polarity. Using the same samples as in the MO investigations, we observe for the first time characteristic steps in the integral magnetization measured by means of a SQUID system, which allows a constant temperature sweep. The integral measurement technique enables the study of the instability phenomenon ("turbulence") in a much wider range of temperatures and fields than the MO investigations, and also in the orientations H_a ∥ c and H_a ⊥ c. As a result, we find turbulence not only in a narrow window of temperatures (65 ≤ T ≤ 80 K), but also in a window of applied negative fields ranging between 30 and 80 mT.

Original language	English
Pages (from-to)	1483-1487
Number of pages	5
Journal	Journal of Low Temperature Physics
Volume	117
Issue number	5-6
DOIs	https://doi.org/10.1023/a:1022518406132
Publication status	Published - 1999
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics

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Cite this

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title = "Instability of the Critical State in NdBa2Cu3O7-δ Single Crystals",

abstract = "Instabilities of the critical state are observed in various NdBa2Cu3O7-δ single crystals by means of direct magneto-optic (MO) imaging while warming up flux states containing vortices of opposite polarity. Using the same samples as in the MO investigations, we observe for the first time characteristic steps in the integral magnetization measured by means of a SQUID system, which allows a constant temperature sweep. The integral measurement technique enables the study of the instability phenomenon ({"}turbulence{"}) in a much wider range of temperatures and fields than the MO investigations, and also in the orientations Ha ∥ c and Ha ⊥ c. As a result, we find turbulence not only in a narrow window of temperatures (65 ≤ T ≤ 80 K), but also in a window of applied negative fields ranging between 30 and 80 mT.",

author = "Koblischka, {Michael R.} and Masato Murakami and Satoru Koishikawa and Johansen, {Tom Henning} and Michael Baziljevich and Thomas Frello and Thomas Wolf",

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language = "English",

volume = "117",

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TY - JOUR

T1 - Instability of the Critical State in NdBa2Cu3O7-δ Single Crystals

AU - Koblischka, Michael R.

AU - Murakami, Masato

AU - Koishikawa, Satoru

AU - Johansen, Tom Henning

AU - Baziljevich, Michael

AU - Frello, Thomas

AU - Wolf, Thomas

PY - 1999

Y1 - 1999

N2 - Instabilities of the critical state are observed in various NdBa2Cu3O7-δ single crystals by means of direct magneto-optic (MO) imaging while warming up flux states containing vortices of opposite polarity. Using the same samples as in the MO investigations, we observe for the first time characteristic steps in the integral magnetization measured by means of a SQUID system, which allows a constant temperature sweep. The integral measurement technique enables the study of the instability phenomenon ("turbulence") in a much wider range of temperatures and fields than the MO investigations, and also in the orientations Ha ∥ c and Ha ⊥ c. As a result, we find turbulence not only in a narrow window of temperatures (65 ≤ T ≤ 80 K), but also in a window of applied negative fields ranging between 30 and 80 mT.

AB - Instabilities of the critical state are observed in various NdBa2Cu3O7-δ single crystals by means of direct magneto-optic (MO) imaging while warming up flux states containing vortices of opposite polarity. Using the same samples as in the MO investigations, we observe for the first time characteristic steps in the integral magnetization measured by means of a SQUID system, which allows a constant temperature sweep. The integral measurement technique enables the study of the instability phenomenon ("turbulence") in a much wider range of temperatures and fields than the MO investigations, and also in the orientations Ha ∥ c and Ha ⊥ c. As a result, we find turbulence not only in a narrow window of temperatures (65 ≤ T ≤ 80 K), but also in a window of applied negative fields ranging between 30 and 80 mT.

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Instability of the Critical State in NdBa₂Cu₃O_7-δ Single Crystals

Abstract

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