SURFACE-INDUCED GIANT ANISOTROPY IN THE ORDER PARAMETER RELAXATION AT CU3AU(001)
SURFACE-INDUCED GIANT ANISOTROPY IN THE ORDER PARAMETER RELAXATION AT CU3AU(001)
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CU3AU(001)阶次参数松弛中的表面引起的巨大各向异性
DOI：
10.1103/physrevlett.78.3475
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发表时间：
1997
影响因子：
8.6
通讯作者：
I. Robinson
中科院分区：
文献类型：
--
作者：
H. Reichert;P. Eng;H. Dosch;I. Robinson
我们提出了在研究 Cu{sub 3}Au(001) 表面附近的有序动力学时发现的一种新颖的表面现象。通过时间分辨 X 射线散射监测有序 L1{sub 2} 结构的不同类别的傅立叶分量，我们发现弛豫行为存在巨大的各向异性。垂直于表面的层状结构松弛得超快，而横向排序则发生得慢得多（{tau}{sup -1}{sub {垂直}}{gt}20{tau}{sup -1}{sub {平行}}）。我们认为，最近发现的振荡偏析轮廓充当二维成核片，用于排列垂直于表面的波矢量。 {版权} {ital 1997} {ital 美国物理学会}
We present a novel surface phenomenon found in the investigation of the ordering kinetics near the surface of Cu{sub 3}Au(001). Monitoring different classes of Fourier components of the ordered L1{sub 2} structure by time-resolved x-ray scattering, we found a giant anisotropy in the relaxation behavior. The layered structure normal to the surface relaxes ultrafast while lateral ordering occurs much more slowly ({tau}{sup -1}{sub {perpendicular}}{gt}20{tau}{sup -1}{sub {parallel}}). We argue that the recently discovered oscillating segregation profile acts as a two-dimensional nucleating sheet for ordering wave vectors normal to the surface. {copyright} {ital 1997} {ital The American Physical Society}