Determination of the spatial length scale of the magnetic field distribution in YBa2Cu3O7 ceramics and Bi2Sr2CaCu2O8 crystal

N. Bontemps; P. Y. Bertin; D. Davidov; P. Monod; C. Lacour; R. Even; V. V. Moshchalkov

doi:10.1016/0921-4534(91)91030-8

Determination of the spatial length scale of the magnetic field distribution in YBa₂Cu₃O₇ ceramics and Bi₂Sr₂CaCu₂O₈ crystal

N. Bontemps^*
, P. Y. Bertin
, D. Davidov
, P. Monod
, C. Lacour
, R. Even
, V. V. Moshchalkov

^*Corresponding author for this work

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

4 Scopus citations

Abstract

We have measured the EPR linewidth of a free radical layer as a function of height (0.28 to 10μm) above the surface of an YBa₂Cu₃O₇ superconducting ceramic. We find characteristic lengthscales of the order of 20-40 μm for the field distribution at the surface. This result rules out the Abrikosov vortex lattice as the main source of surface EPR broadening, which we assign to extrinsic sources such as the grain structure. In contrast, the width of the free radical line, when deposited on the surface of a Bi₂Sr₂CaCu₂O₈ single crystal, exhibits a significant broadening only below the temperature where irreversibility sets in.

Original language	English
Pages (from-to)	1809-1810
Number of pages	2
Journal	Physica C: Superconductivity and its Applications
Volume	185-189
Issue number	PART 3
DOIs	https://doi.org/10.1016/0921-4534(91)91030-8
State	Published - 1 Dec 1991
Externally published	Yes

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title = "Determination of the spatial length scale of the magnetic field distribution in YBa2Cu3O7 ceramics and Bi2Sr2CaCu2O8 crystal",

abstract = "We have measured the EPR linewidth of a free radical layer as a function of height (0.28 to 10μm) above the surface of an YBa2Cu3O7 superconducting ceramic. We find characteristic lengthscales of the order of 20-40 μm for the field distribution at the surface. This result rules out the Abrikosov vortex lattice as the main source of surface EPR broadening, which we assign to extrinsic sources such as the grain structure. In contrast, the width of the free radical line, when deposited on the surface of a Bi2Sr2CaCu2O8 single crystal, exhibits a significant broadening only below the temperature where irreversibility sets in.",

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T1 - Determination of the spatial length scale of the magnetic field distribution in YBa2Cu3O7 ceramics and Bi2Sr2CaCu2O8 crystal

AU - Bontemps, N.

AU - Bertin, P. Y.

AU - Davidov, D.

AU - Monod, P.

AU - Lacour, C.

AU - Even, R.

AU - Moshchalkov, V. V.

PY - 1991/12/1

Y1 - 1991/12/1

N2 - We have measured the EPR linewidth of a free radical layer as a function of height (0.28 to 10μm) above the surface of an YBa2Cu3O7 superconducting ceramic. We find characteristic lengthscales of the order of 20-40 μm for the field distribution at the surface. This result rules out the Abrikosov vortex lattice as the main source of surface EPR broadening, which we assign to extrinsic sources such as the grain structure. In contrast, the width of the free radical line, when deposited on the surface of a Bi2Sr2CaCu2O8 single crystal, exhibits a significant broadening only below the temperature where irreversibility sets in.

AB - We have measured the EPR linewidth of a free radical layer as a function of height (0.28 to 10μm) above the surface of an YBa2Cu3O7 superconducting ceramic. We find characteristic lengthscales of the order of 20-40 μm for the field distribution at the surface. This result rules out the Abrikosov vortex lattice as the main source of surface EPR broadening, which we assign to extrinsic sources such as the grain structure. In contrast, the width of the free radical line, when deposited on the surface of a Bi2Sr2CaCu2O8 single crystal, exhibits a significant broadening only below the temperature where irreversibility sets in.

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AN - SCOPUS:0026404201

SN - 0921-4534

VL - 185-189

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JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - PART 3

ER -

Determination of the spatial length scale of the magnetic field distribution in YBa₂Cu₃O₇ ceramics and Bi₂Sr₂CaCu₂O₈ crystal

Abstract

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