Electrical conduction through bond percolation in Nd0.67Sr 0.33MnO3

Pattabiraman, M, Rangarajan, G and Murugaraj, P 2004, 'Electrical conduction through bond percolation in Nd0.67Sr 0.33MnO3', Solid State Communications, vol. 132, no. 1, pp. 7-11.


Document type: Journal Article
Collection: Journal Articles

Title Electrical conduction through bond percolation in Nd0.67Sr 0.33MnO3
Author(s) Pattabiraman, M
Rangarajan, G
Murugaraj, P
Year 2004
Journal name Solid State Communications
Volume number 132
Issue number 1
Start page 7
End page 11
Total pages 5
Publisher Elsevier BV
Abstract We report our analysis of resistivity data on Nd0.67Sr 0.33MnO3 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.
Subject Electronic and Magnetic Properties of Condensed Matter; Superconductivity
Keyword(s) A. Magnetic semiconductors
A. Manganites
DOI - identifier 10.1016/j.ssc.2004.07.021
Copyright notice © 2004 Elsevier Ltd. All rights reserved
ISSN 0038-1098
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