We have investigated the fabrication and position dependence of superconducting properties of large melt-textured Eu-Ba-Cu-O bulk superconductors for the purpose of application as a compact NMR magnet. We successfully fabricated c-axis oriented single-grain bulk samples up to 65 mm in diameter by melt-processing under a low oxygen partial pressure. The samples of 32 and 47 mm diameters could trap magnetic fields of 1.4 and 1.7 T at 77 K, respectively. Tc in the sample of 33mm diameter is almost similar throughout the sample. In 65 mm-sized sample, however, Tc and J c lowered in inner region of the sample, leading to lowering of maximum trapped field.
ASJC Scopus subject areas
- Physics and Astronomy(all)