Trapped Field Performance of the Gd1+x Ba2-x Cu3O7-δ Bulk Superconductors Fabricated by Cooling-Rate-Control-Melt-Growth

29th International Symposium on Superconductivity

Matsuumi, R.^1 ; Izumi, M.^1 ; Yao, X.^2

Laboratory of Applied Physics, Tokyo University of Marine Science and Technology, 2-1-6 Etchu-jima, Koto-ku, Tokyo

135-8533, Japan^1

State Key Lab for Metal Matrix Composites, Key Lab. of Artificial Structures and Quantum Control, Ministry of Education, Dept. of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai

200240, China^2

关键词: Bulk superconductors;    Effective approaches;    Light rare earths;    Liquid nitrogen temperature;    Stage cooling;    Superconducting properties;    Trapped field;    Trapped-flux densities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012054/pdf
DOI  :  10.1088/1742-6596/871/1/012054

来源: IOP

【 摘 要 】

For LRE1+xBa2-xCu3O7-δ(LRE: Light rare-earth superconductors, e.g., Nd, Sm and Gd), cation off-stoichiometry caused by the substitution of LRE3+/Ba2+degrades their superconducting properties. Cooling-Rate-Control-Melt-Growth (CRCMG) method is an effective approach to suppress the substitution of RE element on Ba sites. To investigate the relationship between the cooling rate and trapped field performance in GdBa2Cu3O7-δbulk, we fabricated some full-growth Gd1+xBa2-xCu3O7-δbulks with different second-stage cooling rates (0.1, 0.3, 0.5, 0.8, and 1.0 °C/h) by the CRCMG method, and studied the correlation of the cooling rate and the trapped flux of these bulks. From the results, we found that the maximum trapped flux density and the trapped flux of all bulks have few difference at liquid nitrogen temperature, which indicates that the cooling rate seems to affect insignificantly the trapped flux property of Gd1+xBa2-xCu3O7-δbulks.