Critical current density and ultra high-voltage transmission electron microscopic image for melt-processed fine filamentary EuBa2Cu3Ox superconductors

✍ Scribed by T. Goto; K. Watanabe; E. Ban; Y. Matsui; T. Nagai; T. Yokosawa

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 341 KB
• Volume: 415
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2004.08.004

✦ Synopsis

We have prepared fine filamentary EuBa 2 Cu 3 O x superconductors by solution spinning and melt processing to fabricate the high-T c superconducting wire with high-critical current density (J c ) at 77 K and high-magnetic fields. The filamentary precursor was partially melted in flowing 0.1% O 2 + Ar and then oxygenated. The samples in diameter of 55 lm had well aligned texture along the filament diameter as well as the length. The T c value of the sample was 90 K. The transport J c for the samples was measured at 77 K in applied magnetic fields up to 14 T by rotating the sample in a direction of the filament diameter. Anisotropic behaviour of the field dependence of J c along the filament diameter was detected. The sample rotated the optimized angle exhibited the highest J c value of 11,000 A/cm 2 at 77 K and 14 T. The transmission electron microscopic image for the filamentary EuBa 2 Cu 3 O x superconductors was observed by using ultra high-voltage transmission electron microscope to clarify the pinning center. Intergrowth of 124-phase and nanoscale particle in the orientated 123 matrix were observed. The presence of such small-scale disorders could improve flux pinning at high fields.