Magnetic reconstruction at the (001) CaMnO3 surface

被引：26

作者：

Filippetti, A ^{[1
]}

Pickett, WE ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 20期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.83.4184

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Mn-terminated (001) surface of the stable antiferromagnetic insulating phase of the cubic perovskite CaMnO3 is found to undergo a magnetic reconstruction consisting of a spin-flip process at the surface: Each Mn spin at the surface hips to pair with one in the subsurface layer. In spite of very little Mn-O charge transfer at the surface, the behavior is driven by the e(g) states due to the d(xy) --> d(z2) charge redistribution. These results, based on local spin density theory, give a double-exchange-like coupling that is driven by the e(g) character, not the additional charge, and may have relevance to colossal magnetoresistive materials.

引用

页码：4184 / 4187

页数：4

共 18 条

[11] Magnetoelectronic and magnetostructural coupling in the La1-xCaxMnO3 system. [J].