抄録
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.
本文言語 | English |
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ページ(範囲) | 633-635 |
ページ数 | 3 |
ジャーナル | Applied Physics Letters |
巻 | 65 |
号 | 5 |
DOI | |
出版ステータス | Published - 1994 |
外部発表 | はい |
ASJC Scopus subject areas
- 物理学および天文学(その他)