ESTIMATES OF ANDERSON ELECTRON-PHONON COUPLING-CONSTANTS OF SMALL POLARONS LOCALIZED AT OXYGEN IONS IN NI1-XLIXO USING A POLARIZABLE POINT-ION SHELL-MODEL

被引：9

作者：

IGUCHI, E

LEE, K

IGUCHI, A

机构：

[1] Materials Science, Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Yokohama National University, Yokohama 240, Tokiwadai, Hodogaya-ku

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1993年 / 62卷 / 04期

关键词：

NI1-XLIXO; DIELECTRIC RELAXATION; ELECTRON-PHONON COUPLING CONSTANTS; NONADIABATIC SMALL POLARON; POLARONIC CONDUCTION;

D O I：

10.1143/JPSJ.62.1135

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Anderson's electron-phonon coupling constants (lambda) of a polaron localized at an O- ion and changes in ionic spacing (x) induced by electron-phonon interaction in Ni1-xLixO have been estimated by referring to the experimental results of dielectric measurements and dc-conductivities at low temperatures. Calculations based upon the combination of Anderson's attractive potential and a shell model yield lambda and x of approximately -3.7 eV/angstrom and approximately -9.8 x 10(-3) angstrom between O- and Ni2+ in [100] direction, and approximately 0.59 eV/angstrom and 6.9 x 10(-2) angstrom between O- and O2- in [110], respectively. This calculation provides evidence for the stability of polarons localized at oxygen sites.

引用

页码：1135 / 1138

页数：4

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