Nonlinear AC susceptibility, surface and bulk shielding

C. J. Van Der Beek; M. V. Indenbom; G. D'Anna; W. Benoit

doi:10.1016/0921-4534(95)00774-1

Nonlinear AC susceptibility, surface and bulk shielding

C. J. Van Der Beek
, M. V. Indenbom
, G. D'Anna
, W. Benoit

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

Abstract

We calculate the nonlinear AC response of a thin superconducting strip in perpendicular field, shielded by an edge current due to the geometrical barrier. A comparison with the results for infinite samples in parallel field, screened by a surface barrier, and with those for screening by a bulk current in the critical state, shows that the AC response due to a barrier has general features that are independent of geometry, and that are significantly different from those for screening by a bulk current in the critical state. By consequence, the nonlinear (global) AC susceptibility can be used to determine the origin of magnetic irreversibility. A comparison with experiments on a Bi₂Sr₂CaCu₂O_8+δ crystal shows that in this material, the low-frequency AC screening at high temperature is mainly due to the screening by an edge current, and that this is the unique source of the nonlinear magnetic response at temperatures above 40 K.

Original language	English
Pages (from-to)	105-120
Number of pages	16
Journal	Physica C: Superconductivity and its Applications
Volume	258
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(95)00774-1
Publication status	Published - 10 Feb 1996
Externally published	Yes

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title = "Nonlinear AC susceptibility, surface and bulk shielding",

abstract = "We calculate the nonlinear AC response of a thin superconducting strip in perpendicular field, shielded by an edge current due to the geometrical barrier. A comparison with the results for infinite samples in parallel field, screened by a surface barrier, and with those for screening by a bulk current in the critical state, shows that the AC response due to a barrier has general features that are independent of geometry, and that are significantly different from those for screening by a bulk current in the critical state. By consequence, the nonlinear (global) AC susceptibility can be used to determine the origin of magnetic irreversibility. A comparison with experiments on a Bi2Sr2CaCu2O8+δ crystal shows that in this material, the low-frequency AC screening at high temperature is mainly due to the screening by an edge current, and that this is the unique source of the nonlinear magnetic response at temperatures above 40 K.",

author = "\{Van Der Beek\}, \{C. J.\} and Indenbom, \{M. V.\} and G. D'Anna and W. Benoit",

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doi = "10.1016/0921-4534(95)00774-1",

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TY - JOUR

T1 - Nonlinear AC susceptibility, surface and bulk shielding

AU - Van Der Beek, C. J.

AU - Indenbom, M. V.

AU - D'Anna, G.

AU - Benoit, W.

PY - 1996/2/10

Y1 - 1996/2/10

N2 - We calculate the nonlinear AC response of a thin superconducting strip in perpendicular field, shielded by an edge current due to the geometrical barrier. A comparison with the results for infinite samples in parallel field, screened by a surface barrier, and with those for screening by a bulk current in the critical state, shows that the AC response due to a barrier has general features that are independent of geometry, and that are significantly different from those for screening by a bulk current in the critical state. By consequence, the nonlinear (global) AC susceptibility can be used to determine the origin of magnetic irreversibility. A comparison with experiments on a Bi2Sr2CaCu2O8+δ crystal shows that in this material, the low-frequency AC screening at high temperature is mainly due to the screening by an edge current, and that this is the unique source of the nonlinear magnetic response at temperatures above 40 K.

AB - We calculate the nonlinear AC response of a thin superconducting strip in perpendicular field, shielded by an edge current due to the geometrical barrier. A comparison with the results for infinite samples in parallel field, screened by a surface barrier, and with those for screening by a bulk current in the critical state, shows that the AC response due to a barrier has general features that are independent of geometry, and that are significantly different from those for screening by a bulk current in the critical state. By consequence, the nonlinear (global) AC susceptibility can be used to determine the origin of magnetic irreversibility. A comparison with experiments on a Bi2Sr2CaCu2O8+δ crystal shows that in this material, the low-frequency AC screening at high temperature is mainly due to the screening by an edge current, and that this is the unique source of the nonlinear magnetic response at temperatures above 40 K.

U2 - 10.1016/0921-4534(95)00774-1

DO - 10.1016/0921-4534(95)00774-1

M3 - Article

AN - SCOPUS:0030084162

SN - 0921-4534

VL - 258

SP - 105

EP - 120

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 1-2

ER -

Nonlinear AC susceptibility, surface and bulk shielding

Abstract

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