Peak effect with tilted fields in melt-processed (Sm, Eu, Gd)Ba2Cu3O7-δ superconductors

A. Hu; H. Zhou; N. Chikumoto; N. Sakai; I. Hirabayashi; M. Murakami

doi:10.1088/0953-2048/17/2/062

Peak effect with tilted fields in melt-processed (Sm, Eu, Gd)Ba₂Cu₃O_7-δ superconductors

A. Hu, H. Zhou, N. Chikumoto, N. Sakai, I. Hirabayashi, M. Murakami

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

3 Citations (Scopus)

Abstract

The peak effect in melt-processed (Sm, Eu, Gd)Ba₂Cu₃O_7-δ crystals was investigated by rotating the angle θ, between applied fields, B_a, and the a-b plane. For B_a ∥ c, the scaling of the pinning force over a wide temperature range showed that the predominant pinning is δT_c style pinning. A linear temperature dependence of the peak field, B_p, at which the magnetic moment showed a secondary peak was observed in the magnetic phase diagram. At 85 K, B_p shifted to a higher field, associated with a systematic decrease of the peak amplitude with θ reaching zero. For B_a ∥ ab, the peak effect displayed the highest peak field and the minimum peak height. An ordering compositional fluctuation was observed both in- and out-of-plane by transmission electron microscopy. Such a 3D distribution of chemical variation could account for the angular dependence of the peak effect.

Original language	English
Pages (from-to)	S56-S60
Journal	Superconductor Science and Technology
Volume	17
Issue number	2
DOIs	https://doi.org/10.1088/0953-2048/17/2/062
Publication status	Published - 2004 Feb 1

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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abstract = "The peak effect in melt-processed (Sm, Eu, Gd)Ba2Cu3O7-δ crystals was investigated by rotating the angle θ, between applied fields, Ba, and the a-b plane. For Ba ∥ c, the scaling of the pinning force over a wide temperature range showed that the predominant pinning is δTc style pinning. A linear temperature dependence of the peak field, Bp, at which the magnetic moment showed a secondary peak was observed in the magnetic phase diagram. At 85 K, Bp shifted to a higher field, associated with a systematic decrease of the peak amplitude with θ reaching zero. For Ba ∥ ab, the peak effect displayed the highest peak field and the minimum peak height. An ordering compositional fluctuation was observed both in- and out-of-plane by transmission electron microscopy. Such a 3D distribution of chemical variation could account for the angular dependence of the peak effect.",

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AU - Hu, A.

AU - Zhou, H.

AU - Chikumoto, N.

AU - Sakai, N.

AU - Hirabayashi, I.

AU - Murakami, M.

PY - 2004/2/1

Y1 - 2004/2/1

N2 - The peak effect in melt-processed (Sm, Eu, Gd)Ba2Cu3O7-δ crystals was investigated by rotating the angle θ, between applied fields, Ba, and the a-b plane. For Ba ∥ c, the scaling of the pinning force over a wide temperature range showed that the predominant pinning is δTc style pinning. A linear temperature dependence of the peak field, Bp, at which the magnetic moment showed a secondary peak was observed in the magnetic phase diagram. At 85 K, Bp shifted to a higher field, associated with a systematic decrease of the peak amplitude with θ reaching zero. For Ba ∥ ab, the peak effect displayed the highest peak field and the minimum peak height. An ordering compositional fluctuation was observed both in- and out-of-plane by transmission electron microscopy. Such a 3D distribution of chemical variation could account for the angular dependence of the peak effect.

AB - The peak effect in melt-processed (Sm, Eu, Gd)Ba2Cu3O7-δ crystals was investigated by rotating the angle θ, between applied fields, Ba, and the a-b plane. For Ba ∥ c, the scaling of the pinning force over a wide temperature range showed that the predominant pinning is δTc style pinning. A linear temperature dependence of the peak field, Bp, at which the magnetic moment showed a secondary peak was observed in the magnetic phase diagram. At 85 K, Bp shifted to a higher field, associated with a systematic decrease of the peak amplitude with θ reaching zero. For Ba ∥ ab, the peak effect displayed the highest peak field and the minimum peak height. An ordering compositional fluctuation was observed both in- and out-of-plane by transmission electron microscopy. Such a 3D distribution of chemical variation could account for the angular dependence of the peak effect.

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Peak effect with tilted fields in melt-processed (Sm, Eu, Gd)Ba₂Cu₃O_7-δ superconductors

Abstract

ASJC Scopus subject areas

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