Bi2212单晶本征钉扎的不可逆线  

IRREVERSIBILITY LINE OF INTRINSIC PINNING IN Bi2212 SINGLE CRYSTAL

作　　者：冯双久[1] 李广[2] 李晓光[2] 

机构地区：[1]信息材料与器件重点实验室(安徽大学) [2]中国科技大学合肥微尺度物质科学国家实验室,材料科学与工程系合肥230026

出　　处：《低温物理学报》2005年第4期360-364,共5页Low Temperature Physical Letters

基　　金：国家重点基础研究发展规划项目(项目编号:NKBRSF-G19990646-03);安徽大学人才队伍建设基金资助的课题~~

摘　　要：通过输运测量得到了磁场垂直于晶体c轴时Bi2212单晶的不可逆线,发现在2T附近发生变化趋势的改变,表明Josephson涡旋物质在此处可能存在相变或渡越行为.采用涡旋弯折扩展模型,分别讨论了低场/高温和高场/低温区域的不可逆线的表达式,并采用这些表达式很好拟合了实验得到的对应区域的不可逆线.The irreversibility line （IL） with the applied magnetic field perpendicular to the c-axis of crystal in Bi2212 single crystal was obtained by resistivity measurement. It was found that IL shows temperature dependence crossover around 2 T, which implies that the Josephson vortex matter may has phase transition or some crossover behavior at that field. IL expressions for low field/high temperature and high field/low temperature regions were deduced, respectively, by using the vortex kink expansion model. The deduced expressions can well reproduce IL obtained in the experimental.

关 键 词：磁通钉扎 不可逆线 Josephson涡旋 Bi2212 不可逆线 单晶 JOSEPHSON 钉扎 本征 发生变化 扩展模型 表达式 

分 类 号：O511[理学—低温物理]