Investigation on magnetic, electrical and thermoelectric power of Bi-substituted La0.8Ca0.2MnO3 manganites

S. O. Manjunatha, Ashok Rao, V. P.S. Awana, G. S. Okram

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Abstract In the present work, the structural, magnetic, magneto-transport and thermoelectric properties of polycrystalline compounds of La0.8-xBixCa0.2MnO3(0≤x≤0.1) compounds are reported. Structure refinement using Rietveld method confirms that the samples are single phased and crystallize in rhombohedral structure with R-3C space group. Magnetic studies reveal that the pristine sample exhibits TC at 221 K and it shift towards lower temperature with Bi doping. Deviation of the temperature dependent of inverse susceptibility curves from the Curie-Weiss law confirms the existence of Griffiths-like phase. All the samples exhibit metal to insulator transition at temperature TMI, which is found to decrease with increase in Bi doping which is consistent with the magnetic studies. Magneto-resistance MR% data shows that its peak value increases with Bi-doping. The analysis of electrical resistivity data in the metallic region (T<TMI) suggests that the electron-electron scattering is predominant in this region whereas the insulating region (T>TMI) is well described using Small polaron hopping (SPH) and Mott's variable range hopping (VRH) models. Analysis of thermoelectric power data in the high temperature region suggests that the SPH mechanism is operative in this regime, while the analysis of low temperature data reveals that the electron-magnon scattering is dominant in the region.

Original languageEnglish
Article number60326
Pages (from-to)130-137
Number of pages8
JournalJournal of Magnetism and Magnetic Materials
Volume394
DOIs
Publication statusPublished - 03-07-2015

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Manganites
Thermoelectric power
Gene Conversion
Doping (additives)
Curie-Weiss law
Temperature
electron scattering
Rietveld method
transport properties
insulators
Electron scattering
magnetic permeability
deviation
Magnetoresistance
electrical resistivity
temperature
shift
curves
metals
Metals

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Investigation on magnetic, electrical and thermoelectric power of Bi-substituted La0.8Ca0.2MnO3 manganites",
abstract = "Abstract In the present work, the structural, magnetic, magneto-transport and thermoelectric properties of polycrystalline compounds of La0.8-xBixCa0.2MnO3(0≤x≤0.1) compounds are reported. Structure refinement using Rietveld method confirms that the samples are single phased and crystallize in rhombohedral structure with R-3C space group. Magnetic studies reveal that the pristine sample exhibits TC at 221 K and it shift towards lower temperature with Bi doping. Deviation of the temperature dependent of inverse susceptibility curves from the Curie-Weiss law confirms the existence of Griffiths-like phase. All the samples exhibit metal to insulator transition at temperature TMI, which is found to decrease with increase in Bi doping which is consistent with the magnetic studies. Magneto-resistance MR{\%} data shows that its peak value increases with Bi-doping. The analysis of electrical resistivity data in the metallic region (T<TMI) suggests that the electron-electron scattering is predominant in this region whereas the insulating region (T>TMI) is well described using Small polaron hopping (SPH) and Mott's variable range hopping (VRH) models. Analysis of thermoelectric power data in the high temperature region suggests that the SPH mechanism is operative in this regime, while the analysis of low temperature data reveals that the electron-magnon scattering is dominant in the region.",
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Investigation on magnetic, electrical and thermoelectric power of Bi-substituted La0.8Ca0.2MnO3 manganites. / Manjunatha, S. O.; Rao, Ashok; Awana, V. P.S.; Okram, G. S.

In: Journal of Magnetism and Magnetic Materials, Vol. 394, 60326, 03.07.2015, p. 130-137.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Investigation on magnetic, electrical and thermoelectric power of Bi-substituted La0.8Ca0.2MnO3 manganites

AU - Manjunatha, S. O.

AU - Rao, Ashok

AU - Awana, V. P.S.

AU - Okram, G. S.

PY - 2015/7/3

Y1 - 2015/7/3

N2 - Abstract In the present work, the structural, magnetic, magneto-transport and thermoelectric properties of polycrystalline compounds of La0.8-xBixCa0.2MnO3(0≤x≤0.1) compounds are reported. Structure refinement using Rietveld method confirms that the samples are single phased and crystallize in rhombohedral structure with R-3C space group. Magnetic studies reveal that the pristine sample exhibits TC at 221 K and it shift towards lower temperature with Bi doping. Deviation of the temperature dependent of inverse susceptibility curves from the Curie-Weiss law confirms the existence of Griffiths-like phase. All the samples exhibit metal to insulator transition at temperature TMI, which is found to decrease with increase in Bi doping which is consistent with the magnetic studies. Magneto-resistance MR% data shows that its peak value increases with Bi-doping. The analysis of electrical resistivity data in the metallic region (T<TMI) suggests that the electron-electron scattering is predominant in this region whereas the insulating region (T>TMI) is well described using Small polaron hopping (SPH) and Mott's variable range hopping (VRH) models. Analysis of thermoelectric power data in the high temperature region suggests that the SPH mechanism is operative in this regime, while the analysis of low temperature data reveals that the electron-magnon scattering is dominant in the region.

AB - Abstract In the present work, the structural, magnetic, magneto-transport and thermoelectric properties of polycrystalline compounds of La0.8-xBixCa0.2MnO3(0≤x≤0.1) compounds are reported. Structure refinement using Rietveld method confirms that the samples are single phased and crystallize in rhombohedral structure with R-3C space group. Magnetic studies reveal that the pristine sample exhibits TC at 221 K and it shift towards lower temperature with Bi doping. Deviation of the temperature dependent of inverse susceptibility curves from the Curie-Weiss law confirms the existence of Griffiths-like phase. All the samples exhibit metal to insulator transition at temperature TMI, which is found to decrease with increase in Bi doping which is consistent with the magnetic studies. Magneto-resistance MR% data shows that its peak value increases with Bi-doping. The analysis of electrical resistivity data in the metallic region (T<TMI) suggests that the electron-electron scattering is predominant in this region whereas the insulating region (T>TMI) is well described using Small polaron hopping (SPH) and Mott's variable range hopping (VRH) models. Analysis of thermoelectric power data in the high temperature region suggests that the SPH mechanism is operative in this regime, while the analysis of low temperature data reveals that the electron-magnon scattering is dominant in the region.

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