Magnetic properties of Ag-added Gd–Ba–Cu–O superconductors

• Published in: Physica. C, Superconductivity Vol. 392; pp. 531 - 534
• Main Authors: Sawamura, Mitsuru, Morita, Mitsuru, Hirano, Housei
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2003
• Subjects: Gd–Ba–Cu–O; HTSC; Trapped field; Y–Ba–Cu–O; Gd–Ba–Cu–O; 74.80.Bj; Y–Ba–Cu–O; 74.72.−h; HTSC; 74.25.Ha; Trapped field
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/S0921-4534(03)01003-7

In order to obtain helpful guidelines for designing high- T c bulk superconductor magnet systems, the gap, temperature and time dependence of the trapped field for Y–Ba–Cu–O and Gd–Ba–Cu–O/Ag bulk superconductors were measured. For the gap dependence, we compared the experimental results and the analytical solution on the condition that J c is constant for the disk-shaped bulk superconductor, and we found that the analytical solution corresponds well with the experimental results. The peak value of the trapped field reached 4.6 T at 63 K for the Gd–Ba–Cu–O bulk superconductor, and the flux creep rate at 63 K was slower than that at 70 and 77 K. This indicates that cooling down to at least 63 K creates superior conditions for the bulk magnet in respect of the increasing trapped field and its stability.