抄録
We have studied the flux pinning in melt-textured (Nd0.33Sm 0.33Gd0.33)Ba2Cu3Oy NSG-123 superconductors with various numbers of Gd2BaCuO5 (Gd-211) particles. Transmission electron microscopy (TEM) showed that submicron Gd-211 particles are uniformly distributed in the superconductive matrix. Dark-field TEM observations further showed that a high density of RE rich RE1+xBa2-xCu3Oy (RE-123ss) clusters 3-10 nm in size were distributed in the NSG-123 matrix. A strongly developed fishtail was observed in the magnetization hysteresis loops of all the samples. A critical current density of 100 kA/cm2 (77 K) was achieved at the secondary peak field of 2 T for the H∥c axis in the NSG-123 sample with 10 mol% Gd-211. Large grain NSG-123 pellets with 30 mol% Gd-211 and 20 wt% AgO 2, 30 mm in diameter and 15 mm in height, exhibited a single-cone profile with a peak value of 1.2 T at 77 K. A higher trapped-field value of 1.5 T was recorded at 2 T, reflecting the secondary peak effect.
本文言語 | English |
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ページ(範囲) | 1016-1018 |
ページ数 | 3 |
ジャーナル | Applied Physics Letters |
巻 | 80 |
号 | 6 |
DOI | |
出版ステータス | Published - 2002 2月 11 |
外部発表 | はい |
ASJC Scopus subject areas
- 物理学および天文学(その他)