Perfect fits of Jc-B dependencies in NEG-123 bulk samples with 30% Gd-211 fine particles

研究成果: Article

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Magnetization hysteresis loops (MHL) were measured on two NEG-123 bulk samples with addition of 30% Gd-211 fine (sub-micron) particles in the temperature range 65-88 K. These two samples possessed significantly different second-to-central peak heights ratios. Both sets of the Jc-B curves could be, however, fitted with a high precision by the same combined analytical function Jc(B) = Jcpexp(-αB/Bp) + Jspbp exp[(1 - (B/Bp)n)/n] in all investigated temperatures. The pinning regimes governing formation of the central and second peak could be separated in this way. As far as the central peak contribution to the MHL becomes usually negligible at around Bp, the shape of Jc(B) above Bp is governed by only a high-field pinning mechanism. The central peak extends to this field region only at temperatures very close to Tc. Good scaling of the pinning force density with temperature gives a further support to the above conclusions.

元の言語English
ページ(範囲)489-493
ページ数5
ジャーナルPhysica C: Superconductivity and its Applications
357-360
発行部数SUPPL. 2
DOI
出版物ステータスPublished - 2001 8
外部発表Yes

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Hysteresis loops
Magnetization
hysteresis
Temperature
magnetization
temperature
scaling
curves

ASJC Scopus subject areas

  • Condensed Matter Physics

これを引用

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title = "Perfect fits of Jc-B dependencies in NEG-123 bulk samples with 30{\%} Gd-211 fine particles",
abstract = "Magnetization hysteresis loops (MHL) were measured on two NEG-123 bulk samples with addition of 30{\%} Gd-211 fine (sub-micron) particles in the temperature range 65-88 K. These two samples possessed significantly different second-to-central peak heights ratios. Both sets of the Jc-B curves could be, however, fitted with a high precision by the same combined analytical function Jc(B) = Jcpexp(-αB/Bp) + Jspbp exp[(1 - (B/Bp)n)/n] in all investigated temperatures. The pinning regimes governing formation of the central and second peak could be separated in this way. As far as the central peak contribution to the MHL becomes usually negligible at around Bp, the shape of Jc(B) above Bp is governed by only a high-field pinning mechanism. The central peak extends to this field region only at temperatures very close to Tc. Good scaling of the pinning force density with temperature gives a further support to the above conclusions.",
keywords = "(Nd,Eu,Gd)BaCuO, Critical currents, Melt-textured materials, Scaling, Vortex physics",
author = "M. Jirsa and Muralidhar Miryala and Masato Murakami",
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doi = "10.1016/S0921-4534(01)00302-1",
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T1 - Perfect fits of Jc-B dependencies in NEG-123 bulk samples with 30% Gd-211 fine particles

AU - Jirsa, M.

AU - Miryala, Muralidhar

AU - Murakami, Masato

PY - 2001/8

Y1 - 2001/8

N2 - Magnetization hysteresis loops (MHL) were measured on two NEG-123 bulk samples with addition of 30% Gd-211 fine (sub-micron) particles in the temperature range 65-88 K. These two samples possessed significantly different second-to-central peak heights ratios. Both sets of the Jc-B curves could be, however, fitted with a high precision by the same combined analytical function Jc(B) = Jcpexp(-αB/Bp) + Jspbp exp[(1 - (B/Bp)n)/n] in all investigated temperatures. The pinning regimes governing formation of the central and second peak could be separated in this way. As far as the central peak contribution to the MHL becomes usually negligible at around Bp, the shape of Jc(B) above Bp is governed by only a high-field pinning mechanism. The central peak extends to this field region only at temperatures very close to Tc. Good scaling of the pinning force density with temperature gives a further support to the above conclusions.

AB - Magnetization hysteresis loops (MHL) were measured on two NEG-123 bulk samples with addition of 30% Gd-211 fine (sub-micron) particles in the temperature range 65-88 K. These two samples possessed significantly different second-to-central peak heights ratios. Both sets of the Jc-B curves could be, however, fitted with a high precision by the same combined analytical function Jc(B) = Jcpexp(-αB/Bp) + Jspbp exp[(1 - (B/Bp)n)/n] in all investigated temperatures. The pinning regimes governing formation of the central and second peak could be separated in this way. As far as the central peak contribution to the MHL becomes usually negligible at around Bp, the shape of Jc(B) above Bp is governed by only a high-field pinning mechanism. The central peak extends to this field region only at temperatures very close to Tc. Good scaling of the pinning force density with temperature gives a further support to the above conclusions.

KW - (Nd,Eu,Gd)BaCuO

KW - Critical currents

KW - Melt-textured materials

KW - Scaling

KW - Vortex physics

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