A transition from large to small polarons in the La0.75Ca0.25MnO3 perovskite system

被引：6

作者：

Lanzara, A

Saini, NL

Brunelli, M

Natali, F

Bianconi, A

Radaelli, P

Cheong, SW

机构：

[1] Univ Rome La Sapienza, Dipartimento Fis, INFM, I-00185 Rome, Italy

[2] Inst Max Von Laue Paul Langevin, F-38043 Grenoble 09, France

[3] AT&T Bell Labs, Murray Hill, NJ 07974 USA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1998年 / 59卷 / 10-12期

关键词：

extended X-ray absorption fine structure (EXAFS); giant magneto-resistance; polarons;

D O I：

10.1016/S0022-3697(98)00218-2

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A quantitative determination of the statistical distribution of the Mn-O instantaneous bond lengths in the La0.75Ca0.25MnO3 system by Mn K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy shows that the giant magneto-resistance (GMR) transition occurs at a crossover from a metallic phase with large (or intermediate) polarons to an insulating phase where small polarons coexist with large (or intermediate) polarons. In the GMR region, the two Mn polaronic domains coexist and share half of the space. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.

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页码：2220 / 2223

页数：4

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