Microstructures and superconducting properties of single domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ superconductors fabricated in air

A. Hu; N. Sakai; K. Ogasawara; M. Murakami

doi:10.1016/S0921-4534(01)00885-1

Microstructures and superconducting properties of single domain (Sm_0.5,Eu_0.5)Ba₂Cu₃ O_7-δ superconductors fabricated in air

A. Hu, N. Sakai, K. Ogasawara, M. Murakami

Research output: Contribution to journal › Article

21 Citations (Scopus)

Abstract

Single-domain (Sm_0.5,Eu_0.5)Ba₂Cu₃ O_7-δ grains were obtained via modified melt processing in air using NdBa₂Cu₃O_7-δ seeds. The facet growth front was observed in the a/b growth direction and the stepwise growth front in the c growth direction. A series of crystal defects: dislocations, twin boundaries and local chemical variations between rare earth and Ba were revealed by transmission electron microscopy and energy dispersive spectrum analysis. In addition, a slightly higher concentration of Sm than Eu was revealed in the matrix. A high T_c value up to 94.5 K and enhanced J_c values over a wide field range at 77 K were obtained after Ar post-annealing. A pellet of diameter 16 mm trapped 0.45 T field at 77 K.

Original language	English
Pages (from-to)	157-163
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	366
Issue number	3
DOIs	https://doi.org/10.1016/S0921-4534(01)00885-1
Publication status	Published - 2002 Jan 15
Externally published	Yes

Keywords

(Sm,Eu)BaCu O
Melt processing
Microstructure defect
Superconducting properties

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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title = "Microstructures and superconducting properties of single domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ superconductors fabricated in air",

abstract = "Single-domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ grains were obtained via modified melt processing in air using NdBa2Cu3O7-δ seeds. The facet growth front was observed in the a/b growth direction and the stepwise growth front in the c growth direction. A series of crystal defects: dislocations, twin boundaries and local chemical variations between rare earth and Ba were revealed by transmission electron microscopy and energy dispersive spectrum analysis. In addition, a slightly higher concentration of Sm than Eu was revealed in the matrix. A high Tc value up to 94.5 K and enhanced Jc values over a wide field range at 77 K were obtained after Ar post-annealing. A pellet of diameter 16 mm trapped 0.45 T field at 77 K.",

keywords = "(Sm,Eu)BaCu O, Melt processing, Microstructure defect, Superconducting properties",

author = "A. Hu and N. Sakai and K. Ogasawara and M. Murakami",

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T1 - Microstructures and superconducting properties of single domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ superconductors fabricated in air

AU - Hu, A.

AU - Sakai, N.

AU - Ogasawara, K.

AU - Murakami, M.

PY - 2002/1/15

Y1 - 2002/1/15

N2 - Single-domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ grains were obtained via modified melt processing in air using NdBa2Cu3O7-δ seeds. The facet growth front was observed in the a/b growth direction and the stepwise growth front in the c growth direction. A series of crystal defects: dislocations, twin boundaries and local chemical variations between rare earth and Ba were revealed by transmission electron microscopy and energy dispersive spectrum analysis. In addition, a slightly higher concentration of Sm than Eu was revealed in the matrix. A high Tc value up to 94.5 K and enhanced Jc values over a wide field range at 77 K were obtained after Ar post-annealing. A pellet of diameter 16 mm trapped 0.45 T field at 77 K.

AB - Single-domain (Sm0.5,Eu0.5)Ba2Cu3 O7-δ grains were obtained via modified melt processing in air using NdBa2Cu3O7-δ seeds. The facet growth front was observed in the a/b growth direction and the stepwise growth front in the c growth direction. A series of crystal defects: dislocations, twin boundaries and local chemical variations between rare earth and Ba were revealed by transmission electron microscopy and energy dispersive spectrum analysis. In addition, a slightly higher concentration of Sm than Eu was revealed in the matrix. A high Tc value up to 94.5 K and enhanced Jc values over a wide field range at 77 K were obtained after Ar post-annealing. A pellet of diameter 16 mm trapped 0.45 T field at 77 K.

KW - (Sm,Eu)BaCu O

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KW - Superconducting properties

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