Strong pinning in ternary (Nd–Sm–Gd)Ba[sub 2]Cu[sub 3]O[sub y] superconductors

Muralidhar, M.; Nariki, S.; Jirsa, M.; Wu, Y.; Murakami, M.
February 2002
Applied Physics Letters;2/11/2002, Vol. 80 Issue 6, p1016
Academic Journal
We have studied the flux pinning in melt-textured (Nd[sub 0.33]Sm[sub 0.33]Gd[sub 0.33])Ba[sub 2]Cu[sub 3]O[sub y] NSG-123 superconductors with various numbers of Gd[sub 2]BaCuO[sub 5] (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 RE[sub 1+x]Ba[sub 2-x]Cu[sub 3]O[sub y] (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[sub 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. © 2002 American Institute of Physics.


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