Periodic fluctuation of Ba/Nd ratio in single crystals of high-J{sub c} NdBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} superconductor
- Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456 (Japan)
- Superconductivity Research Laboratory, ISTEC, 1-10-3 Shinonome, Koto-ku, Tokyo 135 (Japan)
A single crystal of NdBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} was synthesized by the Top Seeded Solution Growth method (TSSG method). Then, the crystal was heat-treated 500{degree}C for 400 h and then 340{degree}C for 200 h in a pure oxygen gas flow. This sample showed critical current density (J{sub c}) as high as 15,000 A/cm{sup 2} under a magnetic field of 5 T, applied along the c-axis of the crystal. Electron microscopic studies with energy dispersive x-ray spectroscopy (EDS) have revealed that the Ba/Nd ratio fluctuates between 2.0 and 0.7 with a wave length of a few tens of nanometer. This implies that superconducting phase of Nd{sub 1.0}Ba{sub 2.0}Cu{sub 3}O{sub 7{minus}{delta}} and non-superconducting phase of Nd{sub 1.8}Ba{sub 1.2}Cu{sub 3}O{sub 7{minus}{delta}} mingle with each other, which is the ideal structure for high- J{sub c} superconducting material. {copyright} {ital 1997 Materials Research Society.}
- OSTI ID:
- 467262
- Journal Information:
- Journal of Materials Research, Vol. 12, Issue 2; Other Information: PBD: Feb 1997
- Country of Publication:
- United States
- Language:
- English
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