多籽晶技术生长大尺寸YBCO单畴超导块材的研究  

MULTI-SEEDING APPROACH TO GROWTH OF LARGE BULK YBCO SUPERCONDUCTOR

作　　者：曹越[1] 吴兴达[2] 胡顺波[1] 唐天威[1] 李冠东[1] 邱傅杰[1] 徐克西[1] 

机构地区：[1]上海大学物理系,上海200444 [2]广东医学院信息工程学院,广东湛江524023

出　　处：《低温物理学报》2013年第3期161-166,共6页Low Temperature Physical Letters

摘　　要：本文利用多籽晶技术成功地生长出直径53mm的大尺寸YBCO单畴超导块材.与传统的单籽晶引导生长相比,该多籽晶技术在大尺寸YBCO单畴生长方面更有效.通过同时使用四个SmBCO籽晶引导生长,大尺寸YB-CO单畴的生长时间得以缩减.实验结果显示多籽晶生长的大尺寸YBCO单畴块材比传统的单籽晶生长的同尺寸块材在超导性能上有所提高.磁通俘获场测量显示多籽晶样品的磁通俘获场比单籽晶样品的峰值更高,均匀性更好.在77K零场冷的环境下,多籽晶的磁悬浮力密度可达到14.6N/cm2,相比单籽晶的12.5N/cm2的磁悬浮力密度有了很大的提高.By multi-seeding approach, YBCO bulks 53 rnm in diameter have been successfully grown. Compared with the commonly used single-seed method, our multi-seeding method is more efficient in large size YBCO growth. Guided by four Sm-123 seeds at the same time, the growth time of large size YBCO is reduced. Experimental results show that the superconducting properties of multi-seeding sample have been improved compared with the same size single-seed sample. The tapped field measurement shows that multi-seeding sample has a larger trapped field peak value and the magnetic flux distribution is more homogeneous. The magnetic levitation force density reaches to 14. 6 N/cm2（77 K, 0. 5 T）, which is significantly larger than 12.5 N/cm2 （77 K, 0. 5 T） of single-seed sample.

关 键 词：多籽晶生长 大尺寸YBCO单畴 SmBCO籽晶 

分 类 号：TM26[一般工业技术—材料科学与工程]