Investigation on structural, magneto-transport, magnetic and thermal properties of La0.8Ca0.2-xBaxMnO3 (0 ≤ x ≤ 0.2) manganites

S. O. Manjunatha, Ashok Rao, Subhashini, G. S. Okram

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

A systematic study on the structural, electrical, magnetic and thermo-electric properties of La0.8BaxCa0.2-xMnO3 (0 ≤ x ≤ 0.2) manganites is carried out in the present work. The samples have been prepared using solid state reaction technique. All the samples are single phased. It is seen that Ba-doping introduces a structural phase transformation viz. from rhombohedral to cubic system. Electric and magnetic studies respectively show that the metal-insulator transition temperature, TMI and Curie temperature, TC increase with Ba-content. Magneto-resistance (MR) data shows that it decreases with Ba-doping. Analyses of the electrical transport data in metallic region i.e. T < TMI shows that the electrical transport is governed predominantly by electron-electron scattering process. On the other hand, the adiabatic small polaron hopping (ASPH) model is appropriate in the high-temperature insulating range viz. T > TMI. We have used the electrical resistivity data in the entire temperature range (50-300 K) and analyzed using the phenomenological percolation model which is based on the phase segregation mechanism. We have analyzed the Seebeck coefficient data which reveals that the small polaron hopping mechanism is operative in high temperature regime and the low temperature region is examined by taking into account the impurity, electron-magnon scattering, and spin wave fluctuation terms. It is established that the electron-magnon scattering is dominating for the thermoelectric transport below TMI.

Original languageEnglish
Pages (from-to)154-161
Number of pages8
JournalJournal of Alloys and Compounds
Volume640
DOIs
Publication statusPublished - 15-08-2015

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Manganites
Transport properties
Magnetic properties
Electron scattering
Thermodynamic properties
Doping (additives)
Gene Conversion
Spin waves
Metal insulator transition
Seebeck coefficient
Magnetoresistance
Curie temperature
Solid state reactions
Temperature
Superconducting transition temperature
Electric properties
Phase transitions
Impurities

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

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title = "Investigation on structural, magneto-transport, magnetic and thermal properties of La0.8Ca0.2-xBaxMnO3 (0 ≤ x ≤ 0.2) manganites",
abstract = "A systematic study on the structural, electrical, magnetic and thermo-electric properties of La0.8BaxCa0.2-xMnO3 (0 ≤ x ≤ 0.2) manganites is carried out in the present work. The samples have been prepared using solid state reaction technique. All the samples are single phased. It is seen that Ba-doping introduces a structural phase transformation viz. from rhombohedral to cubic system. Electric and magnetic studies respectively show that the metal-insulator transition temperature, TMI and Curie temperature, TC increase with Ba-content. Magneto-resistance (MR) data shows that it decreases with Ba-doping. Analyses of the electrical transport data in metallic region i.e. T < TMI shows that the electrical transport is governed predominantly by electron-electron scattering process. On the other hand, the adiabatic small polaron hopping (ASPH) model is appropriate in the high-temperature insulating range viz. T > TMI. We have used the electrical resistivity data in the entire temperature range (50-300 K) and analyzed using the phenomenological percolation model which is based on the phase segregation mechanism. We have analyzed the Seebeck coefficient data which reveals that the small polaron hopping mechanism is operative in high temperature regime and the low temperature region is examined by taking into account the impurity, electron-magnon scattering, and spin wave fluctuation terms. It is established that the electron-magnon scattering is dominating for the thermoelectric transport below TMI.",
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Investigation on structural, magneto-transport, magnetic and thermal properties of La0.8Ca0.2-xBaxMnO3 (0 ≤ x ≤ 0.2) manganites. / Manjunatha, S. O.; Rao, Ashok; Subhashini; Okram, G. S.

In: Journal of Alloys and Compounds, Vol. 640, 15.08.2015, p. 154-161.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Investigation on structural, magneto-transport, magnetic and thermal properties of La0.8Ca0.2-xBaxMnO3 (0 ≤ x ≤ 0.2) manganites

AU - Manjunatha, S. O.

AU - Rao, Ashok

AU - Subhashini,

AU - Okram, G. S.

PY - 2015/8/15

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N2 - A systematic study on the structural, electrical, magnetic and thermo-electric properties of La0.8BaxCa0.2-xMnO3 (0 ≤ x ≤ 0.2) manganites is carried out in the present work. The samples have been prepared using solid state reaction technique. All the samples are single phased. It is seen that Ba-doping introduces a structural phase transformation viz. from rhombohedral to cubic system. Electric and magnetic studies respectively show that the metal-insulator transition temperature, TMI and Curie temperature, TC increase with Ba-content. Magneto-resistance (MR) data shows that it decreases with Ba-doping. Analyses of the electrical transport data in metallic region i.e. T < TMI shows that the electrical transport is governed predominantly by electron-electron scattering process. On the other hand, the adiabatic small polaron hopping (ASPH) model is appropriate in the high-temperature insulating range viz. T > TMI. We have used the electrical resistivity data in the entire temperature range (50-300 K) and analyzed using the phenomenological percolation model which is based on the phase segregation mechanism. We have analyzed the Seebeck coefficient data which reveals that the small polaron hopping mechanism is operative in high temperature regime and the low temperature region is examined by taking into account the impurity, electron-magnon scattering, and spin wave fluctuation terms. It is established that the electron-magnon scattering is dominating for the thermoelectric transport below TMI.

AB - A systematic study on the structural, electrical, magnetic and thermo-electric properties of La0.8BaxCa0.2-xMnO3 (0 ≤ x ≤ 0.2) manganites is carried out in the present work. The samples have been prepared using solid state reaction technique. All the samples are single phased. It is seen that Ba-doping introduces a structural phase transformation viz. from rhombohedral to cubic system. Electric and magnetic studies respectively show that the metal-insulator transition temperature, TMI and Curie temperature, TC increase with Ba-content. Magneto-resistance (MR) data shows that it decreases with Ba-doping. Analyses of the electrical transport data in metallic region i.e. T < TMI shows that the electrical transport is governed predominantly by electron-electron scattering process. On the other hand, the adiabatic small polaron hopping (ASPH) model is appropriate in the high-temperature insulating range viz. T > TMI. We have used the electrical resistivity data in the entire temperature range (50-300 K) and analyzed using the phenomenological percolation model which is based on the phase segregation mechanism. We have analyzed the Seebeck coefficient data which reveals that the small polaron hopping mechanism is operative in high temperature regime and the low temperature region is examined by taking into account the impurity, electron-magnon scattering, and spin wave fluctuation terms. It is established that the electron-magnon scattering is dominating for the thermoelectric transport below TMI.

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