Adiabatic small polaron hopping conduction in La0.7Nd0.3Mn0.8Cr0.2O3

被引：5
作者：
Jung, Woo-Hwan [1 ]
机构：
[1] Howon Univ, Dept Elect, Gunsan 573930, Chunbuk, South Korea
来源：
PHYSICA B-CONDENSED MATTER | 2009年 / 404卷 / 14-15期
关键词：
Adiabatic; Hopping; Non-adiabatic; Small polaron; TRANSPORT-PROPERTIES; MAGNETORESISTANCE; RESISTIVITY; EXCHANGE; MN; CR;
D O I：
10.1016/j.physb.2009.03.017
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The dc conductivity and magnetization of insulating La0.7Nd0.3Mn0.8Cr0.2O3 were measured in temperature ranges of 77-300 and 4.2-300K, respectively. La0.7Nd0.3Mn0.8Cr0.2O3 shows a ferromagnetic transition around 130 K but the sample is insulating throughout the temperature range studied. The temperature dependence of conductivity shows that electronic transport in La0.7Nd0.3Mn0.8Cr0.2O3 is well described by the Emin-Holstein adiabatic small polaron hopping model. The polaron density extracted from conductivity measurements is about 3.0 x 10(20) cm(-3). This result agrees well with the nominal polaron density for La0.7Nd0.3Mn0.8Cr0.2O3, which is also roughly 3.0 x 10(20) cm(-3). We also derived important quantities for transport in La0.7Nd0.3Mn0.8Cr0.2O3. (C) 2009 Elsevier B.V. All rights reserved.
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页码：1953 / 1956
页数：4
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