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.
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References
J. W. Bednorz and K. A. Müller, Z. Phys. B 64, 189 (1986).
M. K. Wu, J. R. Ashburn, C. J. Torng, P. H. Hor, R. L. Meng, L. Gao, Z. J. Huang, Y. Q. Wang, and C. W. Chu, Phys. Rev. Lett. 58, 908 (1987).
M. Nakamura, H. Kutami, and Y. Shiohara, Physica C 260, 297 (1996).
M. Nakamura, Y. Yamada, T. Hirayama, Y. Ikuhara, and Y. Shiohara, Physica C 259, 295 (1996).
S. I. Yoo, N. Sakai, H. Takaichi, T. Higuchi, and M. Murakami, Appl. Phys. Lett. 65, 633 (1994).
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Hirayama, T., Ikuhara, Y., Nakamura, M. et al. Periodic fluctuation of Ba/Nd ratio in single crystals of high-Jc NdBa2Cu3O7−δ superconductor. Journal of Materials Research 12, 293–295 (1997). https://doi.org/10.1557/JMR.1997.0037
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DOI: https://doi.org/10.1557/JMR.1997.0037