Electrical, thermal and magnetic properties of Bi doped La 0.7-xBixSr0.3MnO3 manganites

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We report detailed electrical, magnetic and thermoelectric studies on Bi-doped L0.7-xBixSr0.3MnO 3 (0 ≤ x ≤ 0.25) manganites. The XRD patterns and Rietveld analysis show that the studied materials are single phased. All the compounds, exhibit the expected metal-insulator transition and a decrease in the characteristic metal-insulator transition temperature (TMI) is observed to decrease with increase in Bi-content. Low temperature resistivity data indicates that grain boundaries and electron-electron scattering processes contribute vital role in the conduction process. Magnetic studies also show that the Curie temperature TC is found to decrease with Bi-content. It is observed that MZFC and MFC curves become more manifested as Bi-content is increased which indicates an increase in magnetic frustration arising due to bending of Mn-O-Mn bond. High temperature analysis on the electrical resistivity and thermoelectric power data indicates that small polaron hopping (SPH) model is valid for all the samples.

Original languageEnglish
Pages (from-to)341-351
Number of pages7
JournalJournal of Alloys and Compounds
Volume617
DOIs
Publication statusPublished - 25-12-2014

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Manganites
Metal insulator transition
Magnetic properties
Electric properties
Thermodynamic properties
Rietveld analysis
Gene Conversion
Electron scattering
Thermoelectric power
Curie temperature
Superconducting transition temperature
Grain boundaries
Temperature
Electrons

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "We report detailed electrical, magnetic and thermoelectric studies on Bi-doped L0.7-xBixSr0.3MnO 3 (0 ≤ x ≤ 0.25) manganites. The XRD patterns and Rietveld analysis show that the studied materials are single phased. All the compounds, exhibit the expected metal-insulator transition and a decrease in the characteristic metal-insulator transition temperature (TMI) is observed to decrease with increase in Bi-content. Low temperature resistivity data indicates that grain boundaries and electron-electron scattering processes contribute vital role in the conduction process. Magnetic studies also show that the Curie temperature TC is found to decrease with Bi-content. It is observed that MZFC and MFC curves become more manifested as Bi-content is increased which indicates an increase in magnetic frustration arising due to bending of Mn-O-Mn bond. High temperature analysis on the electrical resistivity and thermoelectric power data indicates that small polaron hopping (SPH) model is valid for all the samples.",
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Electrical, thermal and magnetic properties of Bi doped La 0.7-xBixSr0.3MnO3 manganites. / Daivajna, Mamatha D.; Rao, Ashok; Okram, G. S.

In: Journal of Alloys and Compounds, Vol. 617, 25.12.2014, p. 341-351.

Research output: Contribution to journalArticle

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T1 - Electrical, thermal and magnetic properties of Bi doped La 0.7-xBixSr0.3MnO3 manganites

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AU - Rao, Ashok

AU - Okram, G. S.

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N2 - We report detailed electrical, magnetic and thermoelectric studies on Bi-doped L0.7-xBixSr0.3MnO 3 (0 ≤ x ≤ 0.25) manganites. The XRD patterns and Rietveld analysis show that the studied materials are single phased. All the compounds, exhibit the expected metal-insulator transition and a decrease in the characteristic metal-insulator transition temperature (TMI) is observed to decrease with increase in Bi-content. Low temperature resistivity data indicates that grain boundaries and electron-electron scattering processes contribute vital role in the conduction process. Magnetic studies also show that the Curie temperature TC is found to decrease with Bi-content. It is observed that MZFC and MFC curves become more manifested as Bi-content is increased which indicates an increase in magnetic frustration arising due to bending of Mn-O-Mn bond. High temperature analysis on the electrical resistivity and thermoelectric power data indicates that small polaron hopping (SPH) model is valid for all the samples.

AB - We report detailed electrical, magnetic and thermoelectric studies on Bi-doped L0.7-xBixSr0.3MnO 3 (0 ≤ x ≤ 0.25) manganites. The XRD patterns and Rietveld analysis show that the studied materials are single phased. All the compounds, exhibit the expected metal-insulator transition and a decrease in the characteristic metal-insulator transition temperature (TMI) is observed to decrease with increase in Bi-content. Low temperature resistivity data indicates that grain boundaries and electron-electron scattering processes contribute vital role in the conduction process. Magnetic studies also show that the Curie temperature TC is found to decrease with Bi-content. It is observed that MZFC and MFC curves become more manifested as Bi-content is increased which indicates an increase in magnetic frustration arising due to bending of Mn-O-Mn bond. High temperature analysis on the electrical resistivity and thermoelectric power data indicates that small polaron hopping (SPH) model is valid for all the samples.

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