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Periodic fluctuation of Ba/Nd ratio in single crystals of high-Jc NdBa2Cu3O7−δ superconductor

Published online by Cambridge University Press:  31 January 2011

Tsukasa Hirayama ,
Yuichi Ikuhara ,
Masaru Nakamura ,
Yasuji Yamada  and
Yuh Shiohara
Tsukasa Hirayama
Affiliation:
Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456, Japan
Yuichi Ikuhara
Affiliation:
Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456, Japan
Masaru Nakamura
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1-10-3 Shinonome, Koto-ku, Tokyo 135, Japan
Yasuji Yamada
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1-10-3 Shinonome, Koto-ku, Tokyo 135, Japan
Yuh Shiohara
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1-10-3 Shinonome, Koto-ku, Tokyo 135, Japan
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Abstract

A single crystal of NdBa2Cu3O7−δ was synthesized by the Top Seeded Solution Growth method (TSSG method). Then, the crystal was heat-treated 500 °C for 400 h and then 340 °C for 200 h in a pure oxygen gas flow. This sample showed critical current density (Jc) as high as 15,000 A/cm2 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 wavelength of a few tens of nanometer. This implies that superconducting phase of Nd1.0Ba2.0Cu3O7−δ and nonsuperconducting phase of Nd1.8Ba1.2Cu3O7−δ mingle with each other, which is the ideal structure for high-Jc superconducting material.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 2 , February 1997 , pp. 293 - 295
Copyright
Copyright © Materials Research Society 1997

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