Critical current densities and the effects of thermally assisted flux flow in single crystals of Bi2Sr2CaCu2O8

J. Van Den Berg; C. J. Van Der Beek; P. H. Kes; J. A. Mydosh; M. J.V. Menken; A. A. Menovsky

doi:10.1088/0953-2048/1/5/006

Critical current densities and the effects of thermally assisted flux flow in single crystals of Bi₂Sr₂CaCu₂O₈

J. Van Den Berg
, C. J. Van Der Beek
, P. H. Kes
, J. A. Mydosh
, M. J.V. Menken
, A. A. Menovsky

Universiteit Leiden

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

Abstract

The authors have grown single crystals of Bi₂Sr ₂CaCu₂O₈ and measured their DC magnetisation (using both SQUID and Foner magnetometers) and AC susceptibility in small DC magnetic fields. They find a flux expulsion fraction of up to 34% of the shielding effect in fields down to 3 G, significantly larger than found for the YBa₂Cu₃O₇ crystals. Critical currents were determined as a function of temperature by applying Bean's model and are compared with the critical currents found for single-crystal YBa ₂Cu₃O₇. The critical current densities are strongly dependent on field and temperature. A dramatic frequency dependence of the AC susceptibility in a small DC magnetic field is also observed. They show that a model based upon thermally assisted flux flow (TAFF) accounts for the observed effects.

Original language	English
Article number	006
Pages (from-to)	249-253
Number of pages	5
Journal	Superconductor Science and Technology
Volume	1
Issue number	5
DOIs	https://doi.org/10.1088/0953-2048/1/5/006
Publication status	Published - 1 Dec 1989
Externally published	Yes

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10.1088/0953-2048/1/5/006

Cite this

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title = "Critical current densities and the effects of thermally assisted flux flow in single crystals of Bi2Sr2CaCu2O8",

abstract = "The authors have grown single crystals of Bi2Sr 2CaCu2O8 and measured their DC magnetisation (using both SQUID and Foner magnetometers) and AC susceptibility in small DC magnetic fields. They find a flux expulsion fraction of up to 34\% of the shielding effect in fields down to 3 G, significantly larger than found for the YBa2Cu3O7 crystals. Critical currents were determined as a function of temperature by applying Bean's model and are compared with the critical currents found for single-crystal YBa 2Cu3O7. The critical current densities are strongly dependent on field and temperature. A dramatic frequency dependence of the AC susceptibility in a small DC magnetic field is also observed. They show that a model based upon thermally assisted flux flow (TAFF) accounts for the observed effects.",

author = "\{Van Den Berg\}, J. and \{Van Der Beek\}, \{C. J.\} and Kes, \{P. H.\} and Mydosh, \{J. A.\} and Menken, \{M. J.V.\} and Menovsky, \{A. A.\}",

year = "1989",

month = dec,

day = "1",

doi = "10.1088/0953-2048/1/5/006",

language = "English",

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pages = "249--253",

journal = "Superconductor Science and Technology",

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TY - JOUR

T1 - Critical current densities and the effects of thermally assisted flux flow in single crystals of Bi2Sr2CaCu2O8

AU - Van Den Berg, J.

AU - Van Der Beek, C. J.

AU - Kes, P. H.

AU - Mydosh, J. A.

AU - Menken, M. J.V.

AU - Menovsky, A. A.

PY - 1989/12/1

Y1 - 1989/12/1

N2 - The authors have grown single crystals of Bi2Sr 2CaCu2O8 and measured their DC magnetisation (using both SQUID and Foner magnetometers) and AC susceptibility in small DC magnetic fields. They find a flux expulsion fraction of up to 34% of the shielding effect in fields down to 3 G, significantly larger than found for the YBa2Cu3O7 crystals. Critical currents were determined as a function of temperature by applying Bean's model and are compared with the critical currents found for single-crystal YBa 2Cu3O7. The critical current densities are strongly dependent on field and temperature. A dramatic frequency dependence of the AC susceptibility in a small DC magnetic field is also observed. They show that a model based upon thermally assisted flux flow (TAFF) accounts for the observed effects.

AB - The authors have grown single crystals of Bi2Sr 2CaCu2O8 and measured their DC magnetisation (using both SQUID and Foner magnetometers) and AC susceptibility in small DC magnetic fields. They find a flux expulsion fraction of up to 34% of the shielding effect in fields down to 3 G, significantly larger than found for the YBa2Cu3O7 crystals. Critical currents were determined as a function of temperature by applying Bean's model and are compared with the critical currents found for single-crystal YBa 2Cu3O7. The critical current densities are strongly dependent on field and temperature. A dramatic frequency dependence of the AC susceptibility in a small DC magnetic field is also observed. They show that a model based upon thermally assisted flux flow (TAFF) accounts for the observed effects.

U2 - 10.1088/0953-2048/1/5/006

DO - 10.1088/0953-2048/1/5/006

M3 - Article

AN - SCOPUS:0024885652

SN - 0953-2048

VL - 1

SP - 249

EP - 253

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

IS - 5

M1 - 006

ER -

Critical current densities and the effects of thermally assisted flux flow in single crystals of Bi2Sr2CaCu2O8

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Critical current densities and the effects of thermally assisted flux flow in single crystals of Bi₂Sr₂CaCu₂O₈