Irreversible field determined by pulsed magnetization and compositional fluctuation of melt-processed (Sm, Eu, Gd)Ba2Cu3O 7-δ superconductors

A. Hu, T. Kono, H. Zhou, K. Iida, K. Nakao, Naomichi Sakai, N. Koshizuka, Masato Murakami, I. Hirabayashi

Research output: Contribution to journalArticle

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Abstract

Irreversible fields Birr of melt-processed (Sm, Eu, Gd)Ba 2Cu3O7-δ bulk superconductors with varying (Sm, Eu, Gd)2BaCuO5 concentrations have been measured with pulsed magnetic fields up to 28 T in a temperature range from 55 to 85 K. The temperature dependence of Birr was studied by taking account of the effect of heat generation. In comparison with that including 5 mol% (Sm, Eu, Gd)2BaCuO5 phase the samples with 40 mol% (Sm, Eu, Gd)2BaCuO5 inclusion displayed a lower B irr value for temperatures above 75 K, while Birr was enhanced below 75 K. TEM observation unveiled a sharp contrast between a uniform nano-scaled compositional modulation in compositions with 40% (Sm, Eu, Gd)2BaCuO5 inclusion and an inhomogeneous distribution with very low (Sm, Eu, Gd)2BaCuO5 concentration. The present result could thus be understood in the context of different defect states induced by locally compositional fluctuation.

Original languageEnglish
Pages (from-to)58-63
Number of pages6
JournalSuperconductor Science and Technology
Volume18
Issue number1
DOIs
Publication statusPublished - 2005 Jan

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Superconducting materials
Magnetization
inclusions
magnetization
heat generation
Heat generation
modulation
Temperature
temperature dependence
transmission electron microscopy
temperature
defects
magnetic fields
Modulation
Magnetic fields
Transmission electron microscopy
Defects
Chemical analysis

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Irreversible field determined by pulsed magnetization and compositional fluctuation of melt-processed (Sm, Eu, Gd)Ba2Cu3O 7-δ superconductors. / Hu, A.; Kono, T.; Zhou, H.; Iida, K.; Nakao, K.; Sakai, Naomichi; Koshizuka, N.; Murakami, Masato; Hirabayashi, I.

In: Superconductor Science and Technology, Vol. 18, No. 1, 01.2005, p. 58-63.

Research output: Contribution to journalArticle

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abstract = "Irreversible fields Birr of melt-processed (Sm, Eu, Gd)Ba 2Cu3O7-δ bulk superconductors with varying (Sm, Eu, Gd)2BaCuO5 concentrations have been measured with pulsed magnetic fields up to 28 T in a temperature range from 55 to 85 K. The temperature dependence of Birr was studied by taking account of the effect of heat generation. In comparison with that including 5 mol{\%} (Sm, Eu, Gd)2BaCuO5 phase the samples with 40 mol{\%} (Sm, Eu, Gd)2BaCuO5 inclusion displayed a lower B irr value for temperatures above 75 K, while Birr was enhanced below 75 K. TEM observation unveiled a sharp contrast between a uniform nano-scaled compositional modulation in compositions with 40{\%} (Sm, Eu, Gd)2BaCuO5 inclusion and an inhomogeneous distribution with very low (Sm, Eu, Gd)2BaCuO5 concentration. The present result could thus be understood in the context of different defect states induced by locally compositional fluctuation.",
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AU - Kono, T.

AU - Zhou, H.

AU - Iida, K.

AU - Nakao, K.

AU - Sakai, Naomichi

AU - Koshizuka, N.

AU - Murakami, Masato

AU - Hirabayashi, I.

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N2 - Irreversible fields Birr of melt-processed (Sm, Eu, Gd)Ba 2Cu3O7-δ bulk superconductors with varying (Sm, Eu, Gd)2BaCuO5 concentrations have been measured with pulsed magnetic fields up to 28 T in a temperature range from 55 to 85 K. The temperature dependence of Birr was studied by taking account of the effect of heat generation. In comparison with that including 5 mol% (Sm, Eu, Gd)2BaCuO5 phase the samples with 40 mol% (Sm, Eu, Gd)2BaCuO5 inclusion displayed a lower B irr value for temperatures above 75 K, while Birr was enhanced below 75 K. TEM observation unveiled a sharp contrast between a uniform nano-scaled compositional modulation in compositions with 40% (Sm, Eu, Gd)2BaCuO5 inclusion and an inhomogeneous distribution with very low (Sm, Eu, Gd)2BaCuO5 concentration. The present result could thus be understood in the context of different defect states induced by locally compositional fluctuation.

AB - Irreversible fields Birr of melt-processed (Sm, Eu, Gd)Ba 2Cu3O7-δ bulk superconductors with varying (Sm, Eu, Gd)2BaCuO5 concentrations have been measured with pulsed magnetic fields up to 28 T in a temperature range from 55 to 85 K. The temperature dependence of Birr was studied by taking account of the effect of heat generation. In comparison with that including 5 mol% (Sm, Eu, Gd)2BaCuO5 phase the samples with 40 mol% (Sm, Eu, Gd)2BaCuO5 inclusion displayed a lower B irr value for temperatures above 75 K, while Birr was enhanced below 75 K. TEM observation unveiled a sharp contrast between a uniform nano-scaled compositional modulation in compositions with 40% (Sm, Eu, Gd)2BaCuO5 inclusion and an inhomogeneous distribution with very low (Sm, Eu, Gd)2BaCuO5 concentration. The present result could thus be understood in the context of different defect states induced by locally compositional fluctuation.

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