TY - JOUR
T1 - Periodic fluctuation of Ba/Nd ratio in single crystals of high-Jc NdBa2Cu3O7-δ superconductor
AU - Hirayama, Tsukasa
AU - Ikuhara, Yuichi
AU - Nakamura, Masaru
AU - Yamada, Yasuji
AU - Shiohara, Yuh
N1 - Funding Information:
The authors would like to thank Dr. Takashi Yanaka and Mr. Kazuhiko Moriyama of Topcon Corporation for technical assistance to use the field-emission electron microscope. This work was supported by New Energy and Industrial Technology Development Organization (NEDO) through International Superconductivity Technology Center (ISTEC).
PY - 1997/2
Y1 - 1997/2
N2 - 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.
AB - 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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U2 - 10.1557/jmr.1997.0037
DO - 10.1557/jmr.1997.0037
M3 - Article
AN - SCOPUS:0031078296
VL - 12
SP - 293
EP - 295
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 2
ER -