Surface segregation-induced critical phenomena at FeCo(001) surfaces

被引：26

作者：

Krimmel, S ^{[1
]}

Donner, W ^{[1
]}

Nickel, B ^{[1
]}

Dosch, H ^{[1
]}

Sutter, C ^{[1
]}

Grubel, G ^{[1
]}

机构：

[1] EUROPEAN SYNCHROTRON RADIAT FACIL,F-38042 GRENOBLE,FRANCE

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.78.3880

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present an x-ray scattering study of the continuous B2-A2 order-disorder transition in semi-infinite FeCo using synchrotron radiation, which gives access to the weak one-electron contrast associated with the B2 ordering phenomena in this alloy. The asymptotic (001) Bragg scattering profiles disclose an oscillating Fe-Co layering profile, which alters the surface critical phenomena in a characteristic way: The surface-related order parameter persists above the bulk critical temperature and exhibits a temperature dependence which provides unambiguous evidence for the existence of a surface field (h(l)) which couples to the surface susceptibility.

引用

页码：3880 / 3883

页数：4

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