ON THE STRUCTURE OF THE ORTHO-II PHASE OF YBA2CU3O6+X - OXYGEN ORDERING AND CORRELATED ATOMIC DISPLACEMENTS

被引:34
作者
BURLET, P
PLAKTHY, VP
MARIN, C
HENRY, JY
机构
[1] Centre d'Etudes Nucléaires, DRFMC-SPSMS, MDN, 38041 Grenoble Cedex
关键词
D O I
10.1016/0375-9601(92)90280-Y
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A neutron diffraction study of the YBa2Cu3O6.45 single crystal in the ortho-II phase gives evidence of doubling of the unit cell along the a-axis. For the first time a quantitative intensity analysis of the superstructure reflections has been performed. It is found that, in addition to the formation of alternating Cu (1)-O and Cu (1)-vacancy chains, the apex oxygen O(1) and the cations (Y, Ba, Cu (2) ) are involved in the superstructure. In two adjacent unit cells these atoms have opposite displacements, the magnitude of which is derived.
引用
收藏
页码:401 / 404
页数:4
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