Top-seeded infiltration growth of (Y, Gd)Ba2Cu3Oy bulk superconductors with high critical current densities. (15th September 2017)

• Record Type: Journal Article
• Authors: Das, Dhruba; Muralidhar, M; Rao, M S Ramachandra; Murakami, Masato
• Is Part Of: Superconductor science & technology. Volume 30:Number 10(2017:Oct.)
• Publication Date: 2017-09-15
• Subjects: top-seeded infiltration growth -- critical current density -- transition temperature -- microstructure -- volume fraction -- pinning; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/aa83da
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: We employed the top-seeded infiltration-growth (IG) process for the fabrication of bulk (Y, Gd)Ba2 Cu3 Oy (YG-123) superconductors by varying the composition of (Y, Gd)2 BaCuO5 (YG-211) and compared with bulk YBa2 Cu3 Oy (Y-123) superconductors grown under similar conditions. IG-processed YG-123 exhibited J c (77 K) of 4.78 × 10 4 A cm −2 in zero field, which was higher than the value of 3.71 × 10 4 A cm −2 for Y-123. The superconducting transition temperature ( T c ) of YG-123 increased with increasing Gd content. However, there was spatial variation in the superconducting properties of IG-processed YG-123 samples due to the inhomogeneous distribution of YG-211. J c values of YG-123 decreased when increasing the distance from the seed both along the a and c -axis directions. The scaling studies of the pinning behavior for YG-123 showed that non-superconducting YG-211 particles act as effective pinning centers, supported by the fact that δT c type pinning is active in the system.