Polarons and isotope effect in manganites

被引：11

作者：

Nagaev, EL ^{[1
]}

机构：

[1] Inst High Pressure Phys, Troitsk 142092, Moscow Region, Russia

来源：

PHYSICS LETTERS A | 1999年 / 258卷 / 01期

基金：

俄罗斯基础研究基金会;

关键词：

D O I：

10.1016/S0375-9601(99)00293-5

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Numerical estimates are carried out which show that the polaronic effects cannot be an origin of specific properties of the CMR materials. A quantum-mechanical calculation of the charge carrier band narrowing with increasing temperature is carried out for the double-exchange systems. Comparing its results with experimental data shows that the hole-phonon coupling in them is too weak for the small polaron formation. Despite this, a giant isotope effect is possible in the manganites due to an isotope dependence of the nonstoichiometry of manganites. to which lattice vibrations contribute considerably. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：65 / 73

页数：9

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