纳米ZrO_2掺杂对烧结DyBaCuO块材微观结构及其超导电性的影响  

EFFECT OF Nano-ZrO_2 DOPING ON STRUCTURE AND SUPERCONDUCTING PROPERTIES OF SINTERED DyBaCuO

作　　者：刘石香[1] 付华明[1] 徐克西[1] 

机构地区：[1]上海大学物理系,上海200436

出　　处：《低温物理学报》2004年第4期273-279,共7页Low Temperature Physical Letters

基　　金：上海市科委纳米专项 (项目编号 :0 2 5 2NM0 2 0 )资助的课题~~

摘　　要：研究了纳米ZrO2 掺杂及其掺杂浓度对烧结DyBa2 Cu3Oy 超导体的转变温度Tc 和临界电流Ic 在零磁场和磁场中的行为 ,在磁场中发现掺杂样品的临界电流密度明显高于纯Dy BaCuO样品 .这种磁场行为可能与掺杂样品粒子分布更加均匀 ,富纳米粒子区明显增加 。The effect of nano-ZrO-2 doped in sintered DyBa-2Cu-3O-y was studied. Experiments on R-T curves and I-V characters of the studied samples show that doping with nano-ZrO-2 particles is favorable for enhancement of critical current for the sample under external magnetic field. Such a behavior seems to be resulted from regularly distributed dislocations and substantial increasing in rich nano-grain locations in the doped samples, which may act as effective pinning centers.

关 键 词：钉扎 临界电流密度 超导体 超导电性 掺杂 均匀 磁场 粒子分布 中心 转变温度 

分 类 号：O511[理学—低温物理] TM26[理学—物理]