OXYGEN MONOLAYERS ADSORBED ON GRAPHITE STUDIED BY NEUTRON-SCATTERING

被引:94
作者
NIELSEN, M [1 ]
MCTAGUE, JP [1 ]
机构
[1] UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024
来源
PHYSICAL REVIEW B | 1979年 / 19卷 / 06期
关键词
D O I
10.1103/PhysRevB.19.3096
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The phase diagram of absorbed films of O2 molecules on (002) surfaces of graphite has been measured in the range of densities from submonolayer to 1.6 monolayer. This system is particularly interesting because it orders magnetically below 11.9 K for dense monolayer and higher coverages. This magnetic order is observed both through the antiferromagnetic-superstructure-Bragg reflection as well as through the accompanying magnetostrictive distortion which is seen as a splitting of the nuclear Bragg scattering peak. In all, three distinct two-dimensionally ordered phases have been found, each being incommensurate with the graphite surface lattice. Both first-order and continuous transitions have been observed between these phases. © 1979 The American Physical Society.
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页码:3096 / 3106
页数:11
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