Melt processing for obtaining NdBa2Cu3Oy superconductors with high Tc and large Jc

S. I. Yoo, N. Sakai, H. Takaichi, T. Higuchi, M. Murakami

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A reduced oxygen atmosphere during melt processing turned out to be critical for the fabrication of NdBa2Cu3Oy (Nd123) superconductors possessing high superconducting transition temperature (Tc) with a sharp transition and large critical current density (Jc) at 77 K. In a dc magnetization measurement, Nd123 superconductors melt processed in flowing a mixture gas of 1% O2 in Ar exhibited the Tc of about 95 K and the transition width of 1.5 K with the applied field of 10 Oe. A four-probe measurement showed the zero resistive transition Tc (R=0) of about 95 K. An anomalous peak effect in the magnetization hysteresis (M-H) loops was commonly observed and lead to large magnetic Jc of 2×104 A/cm2 at 77 K and 2 T for the applied field H parallel to the c axis of a sample (H∥c). This achievement is attributable to a preferential formation of high T c phase (x<0.1) among the Nd1+xBa2-xCu 3Oy solid solutions in a reduced oxygen atmosphere.

Original languageEnglish
Pages (from-to)633-635
Number of pages3
JournalApplied Physics Letters
Issue number5
Publication statusPublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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