RELAXATION AND DYNAMICS OF THE (001) SURFACES OF CRYSTALS WITH PEROVSKITE STRUCTURE

被引：3

作者：

SCHRODER, U

PRADE, J

DEWETTE, FW

KULKARNI, AD

KRESS, W

机构：

[1] UNIV TEXAS,DEPT PHYS,AUSTIN,TX 78712

[2] MAX PLANCK INST FESTKORPERFORSCH,W-7000 STUTTGART 80,GERMANY

来源：

SUPERLATTICES AND MICROSTRUCTURES | 1990年 / 7卷 / 03期

基金：

美国国家科学基金会;

关键词：

Crystals;

D O I：

10.1016/0749-6036(90)90302-N

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Surface relaxation is the result of the imbalance of the forces acting on particles at or near a crystal surface, when they occupy their unrelaxed bulk positions. While in most alkali halides the relaxation has practically no influence on the surface dynamics, the situation is totally different for crystals with perovskite structure. These compounds undergo various structural phase transitions which are associated with a softening of bulk lattice modes. Correspondingly, there exist soft surface modes which are strongly dependent on relaxation. In this paper we investigate the relaxation pattern and the surface dynamics of KMnF3 and SrTiO3. The temperature dependence of the surface modes and the surface reconstruction associated with the soft surface mode in KMnF3 will be discussed. © 1990.

引用

页码：247 / 252

页数：6

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