Electric, magnetic, and thermo-electric properties of Cr doped La0.8Ca0.2Mn1-xCrxO3 manganites

Manjunatha, S O and Rao, Ashok and Babu, P D and Tarachand, . and Okram, G S (2016) Electric, magnetic, and thermo-electric properties of Cr doped La0.8Ca0.2Mn1-xCrxO3 manganites. Solid State Communications, 239 (25). pp. 37-43. ISSN 0038-1098

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Abstract

A detailed study of the structural, magnetic, magneto-transport and thermoelectric properties of polycrystalline La0.8Ca0.2Mn1-xCrxO3 (0<x<0.07) compounds is presented in the present communication. XRD studies confirm that the samples are pure and single phased. We have observed from electrical and magnetic studies that all the samples are exhibiting metal-insulator transition temperature, TMI and ferromagnetic-paramagnetic (FM-PM) transition temperature, TC. With increasing Cr-content, both TMI & TC are observed to decrease. The electrical resistivity data is analyzed using different theoretical models at various regions viz., metallic, insulating and percolation region. Analysis in the metallic region (T<TMI) suggests that the electron-electron scattering in predominant in the region whereas the insulating region (T>TMI) is well described using SPH model. However, the resistivity data in the whole temperature range is analyzed using a phenomenological model based on phase segregation of ferromagnetic metallic and paramagnetic insulating regions. Thermoelectric power, S measurements were performed to understand the conduction mechanism and to ascertain the types of charge carrier responsible for conduction. It is observed that pristine as well as Cr-doped compounds show positive value of S which demonstrates that the charge carriers are holes.

Item Type: Article
Uncontrolled Keywords: Manganites, Thermoelectric power
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 31 Aug 2016 14:54
Last Modified: 31 Aug 2016 15:04
URI: http://eprints.manipal.edu/id/eprint/146887

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