On the absence of bipolarons in manganese perovskites

被引：3

作者：

Chipara, M

Skomski, R

Liou, SH

Dowben, PA

Adenwalla, S ^{[1
]}

机构：

[1] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA

[2] Univ Nebraska, Ctr Mat Res & Anal, Lincoln, NE 68588 USA

来源：

MATERIALS LETTERS | 2005年 / 59卷 / 2-3期

基金：

美国国家科学基金会;

关键词：

electron spin resonance; polaron/bipolaron; electronic materials; manganese perovskites;

D O I：

10.1016/j.matlet.2004.10.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The paramagnetic phase of La0.65Ca0.35MnO3 and La0.65Pb0.35MnO3 powders was investigated by electron spin resonance. The resonance spectra, for a range of temperatures, was used to examine the presence of polarons and bipolarons. The resonance lines are compatible with the presence of polarons (g approximate to 2), but the characteristic high-spin bipolaron lines (g approximate to 4) are absent. The results are inconsistent with the presence of high-spin bipolarons. The evidence with respect to low-spin bipolarons is less conclusive, although the temperature dependence of the resonance line parameters speaks against the presence of low-spin bipolarons. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：297 / 301

页数：5

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