脉冲场励磁YBCO块材俘获磁通特性  

Characteristics of the trapped field of the YBCO bulk magnetized by the pulsed field

作　　者：岑冀娜[1] 王家素[1] 宋宏海[1] 郑珺[1] 张龙财[1] 

机构地区：[1]西南交通大学超导技术研究所,成都610031

出　　处：《低温与超导》2006年第3期198-200,共3页Cryogenics and Superconductivity

基　　金：国家863计划资助(2005AA306150);国家自然科学基金(50377036)资助

摘　　要：研究了熔融织构法制备的单畴高温超导YBaCuO块材在脉冲场下的俘获磁通特性。分别测试了YBCO块材在不同强度脉冲场下的俘获磁场,并对实验结果进行了分析。实验发现:YBCO块材在脉冲场输入电压小于300V时的俘获磁场,随着外加脉冲场强度的增加而增加;而脉冲输入电压大于300V时,俘获磁场并没有继续增加。实验获得的超导块材俘获磁场图形呈现出明显的十字结构,这是由于块材采用顶部籽晶熔融织构生长技术、存在五个生长区域、不同生长区域及边界处临界电流密度的不同而导致的。The experimental trapped fields of the melt - texturing processed YBCO bulk superconductor were discussed after the magnetization of pulsed fields. It was found that the maximum trapped fields of this single - domain YBCO grain did not increase with the applied pulsed field when the pulse voltage up to 350V. The highest trapped field up to 0.37T was achieved around the applied pulsed field of 300V. Next, the trapped field profiles presented the obvious cross shapes. There are five growth domains in each of the sample. The difference of the shielding current distributions in each domain and each boundary results in the crossing shape in the flux profiles.

关 键 词：高温超导块材 俘获磁场 脉冲励磁 生长区域 生长区域边界 

分 类 号：TB552[理学—物理] TM262[理学—声学]