YBa_2Cu_3O_(6+ε)正交非超导相到正交超导相的转变  

THE TRANSITION FROM ORTHORHOMBIC NONSUPERCONDUCTING PHASE TO ORTHORHOMBIC SUPERCONDUCTING PHASE IN YBa_2Cu_3O_(6+ε)

作　　者：廖秉良 黎夏生[2] 熊予莹[2] 黄波[2] 杨世琪[2] 

机构地区：[1]华南师范大学实验中心 [2]华南师范大学物理系

出　　处：《华南师范大学学报（自然科学版）》1992年第2期25-28,共4页Journal of South China Normal University(Natural Science Edition)

基　　金：广东省自然科学基金资助项目

摘　　要：在缺氧情况下,烧结出的氧化物YBa_2Cu_3O_(6+ε)样品,经X射线衍射分析为正交相,但在液氮温区没有超导电性.把原样品放在氧气氛下进行热处理,可转变为高Tc正交超导导相.我们认为,这是因为在热处理过程中样品吸收了氧,使得Cu(1)-O(1)链上氧的占据率增加所致.YBa2Cu3O6+(?) sintered under the insufficient oxygen condition is proved, by means of X-ray diffraction, to have orthorhombic phase but no supercond-utcivity at liquid nitrogen temperature. However, having been heat-treated at oxygen atmosphere, it can be transited to orthorhombic high Tc superconducting phase. Such a transition may be caused by the fact that the sample absorbs oxygen during the heat-treating, resulting in the increase in occupancy of O( 1 )-O( 1 ) chains.

关 键 词：正交相 超导相 非超导相 氧化物超导体 超导电体 

分 类 号：O511.1[理学—低温物理]