Electrical conduction through bond percolation in Nd0.67Sr0.33MnO3

被引：24

作者：

Pattabiraman, M

Rangarajan, G

Murugaraj, P

机构：

[1] Indian Inst Technol, Dept Phys, Madras 600036, Tamil Nadu, India

[2] RMIT Univ, Dept Appl Chem, Melbourne, Vic 3001, Australia

来源：

SOLID STATE COMMUNICATIONS | 2004年 / 132卷 / 01期

关键词：

magnetic semiconductors; manganites;

D O I：

10.1016/j.ssc.2004.07.021

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report our analysis of resistivity data on Nd0.67Sr0.33MnO3 polycrystalline samples as a function of preparative conditions using a bond percolation model for a random mixture of metallic and insulating regions, assuming polaronic transport above and below the metal-insulator (M-I) transition temperature. Our analysis suggests that for oxygen deficient compounds the M-I transition that occurs at a lower temperature than the ferromagnetic transition arises from a percolation of the metallic regions. The temperature dependence of resistivity and thermopower suggests the existence of a bimodal distribution of conductivities. (C) 2004 Elsevier Ltd. All rights reserved.

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页码：7 / 11

页数：5

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