融熔织构YBa_2Cu_3O_7的电阻展宽  

BROADENING OF RESISTANCE TRANSITION FOR MELT-TEXTURED YBa_2Cu_3O_7

作　　者：史可信[1] 曾朝阳[1] 张贻瞳 余正[1] 丁世英[1] 姚希贤[1] 

机构地区：[1]南京大学物理系固体微结构实验室,南京210008

出　　处：《低温物理学报》1992年第6期415-419,共5页Low Temperature Physical Letters

摘　　要：测量了融熔织构 YBa_2Cu_3O_7在磁场中电阻转变的展宽效应.发现 R(T,H)=R_0exp[-U_0/k_BT],仍满足 Arrhenius 关系,钉扎能 U_0(H)仅为 eV 量级.讨论了影响 J_c 和磁通蠕动的因素.Broadening of resistance curve of Melt-Textured YBa2Cu3O7 sample in magnetic fields was measured. It was found that the broadening of resistance obeys Arrhe-nius relation, K(T,h) = R0exp( - U0/kBT), as single crystals. Flux pinning energy U0 is of magnitude of leV. Some factors that are relative to Jc are discussed.

关 键 词：钉扎 ARRHENIUS 高温超导体 YBa₂Cu₃O₇ 临界电流密度 低温物理学报 磁弛豫 电磁性质 热激活 半对数坐标 

分 类 号：O4[理学—物理]