Surface vibrations and relaxation effects in Cu(001) studied by x-ray diffraction

被引：7
|
作者：
Mironets, O. [1 ]
Meyerheim, H. L. [1 ]
Tusche, C. [1 ]
Zschack, P. [2 ]
Hong, H. [2 ]
Jeutter, N. [3 ]
Felici, R. [3 ]
Kirschner, J. [1 ]
机构：
[1] Max Planck Inst Mikrostrukturphys, D-06120 Halle, Germany
[2] Argonne Natl Lab, APS, Argonne, IL 60439 USA
[3] European Synchrotron Radiat Facil, F-38043 Grenoble, France
来源：
PHYSICAL REVIEW B | 2008年 / 78卷 / 15期
关键词：
D O I：
10.1103/PhysRevB.78.153401
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A highly precise surface x-ray-diffraction study of the uncovered Cu(001) surface kept at 160 K was carried out. Based on two independent experiments we find that the first (d(12)) and second (d(23)) interlayer spacings are contracted by 1.4 +/- 0.4% and expanded by 0.3 +/- 0.4% relative to the bulk value (d(b)=1.808 A), respectively. The root-mean-square (rms) isotropic vibrational amplitude of the top layer atoms (0.095 A) is enhanced by 80% over the bulk, rapidly decreasing to 20% and 5% for the second and third layers (average values). The rms amplitude top layer vibrations are isotropic within the experimental uncertainty of about 0.02 A.
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页数：4
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