Studies on magneto-resistance, magnetization and thermoelectric power of Cr substituted La0.65Ca0.35Mn1-xCrxO3 (0≤x≤0.07) manganites

S. O. Manjunatha, Ashok Rao, P. D. Babu, Tarachand, G. S. Okram

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Abstract A systematic investigation has been carried out on effect of Cr-doping on structural, magneto-resistance, magnetic and thermoelectric power properties of La0.65Ca0.35Mn1-xCrxO3 compounds. Samples were prepared using conventional solid state reaction method. The XRD analysis using Rietveld refinement reveals that the samples are single phased. Temperature dependent electrical resistivity measurements show the existence of the expected metal-insulator transition (TMI) which is followed by a small hump at temperatures lower than TMI. With the application of magnetic field, resistivity of all the samples is found to decrease and TMI is observed to shift towards higher temperature. This is attributed to induced magnetic ordering of the localized t2g spins and increased electron transfer integral between Mn3+/Mn4+ via oxygen by the application of magnetic field. MR% is observed to increase with the increasing Cr concentration. Magnetic studies show that the Curie temperature, TC and magnetic moment decreases with Cr-content which is consistent with the electrical studies. Electrical resistivity and thermoelectric power data have been analyzed using theoretical models and both suggest that the small polaron hopping (SPH) model is operative in the high temperature insulating region for the entire series of samples.

Original languageEnglish
Article number309033
Pages (from-to)1-9
Number of pages9
JournalPhysica B: Condensed Matter
Volume475
DOIs
Publication statusPublished - 30-06-2015

Fingerprint

Manganites
Thermoelectric power
Magnetoresistance
Magnetization
magnetization
electrical resistivity
Magnetic fields
moments
Gene Conversion
Temperature
Rietveld refinement
Metal insulator transition
Curie temperature
Magnetic moments
Solid state reactions
magnetic fields
electron transfer
magnetic moments
Doping (additives)
insulators

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

@article{931afde21f4543859bbbe3c3fbe5b3ac,
title = "Studies on magneto-resistance, magnetization and thermoelectric power of Cr substituted La0.65Ca0.35Mn1-xCrxO3 (0≤x≤0.07) manganites",
abstract = "Abstract A systematic investigation has been carried out on effect of Cr-doping on structural, magneto-resistance, magnetic and thermoelectric power properties of La0.65Ca0.35Mn1-xCrxO3 compounds. Samples were prepared using conventional solid state reaction method. The XRD analysis using Rietveld refinement reveals that the samples are single phased. Temperature dependent electrical resistivity measurements show the existence of the expected metal-insulator transition (TMI) which is followed by a small hump at temperatures lower than TMI. With the application of magnetic field, resistivity of all the samples is found to decrease and TMI is observed to shift towards higher temperature. This is attributed to induced magnetic ordering of the localized t2g spins and increased electron transfer integral between Mn3+/Mn4+ via oxygen by the application of magnetic field. MR{\%} is observed to increase with the increasing Cr concentration. Magnetic studies show that the Curie temperature, TC and magnetic moment decreases with Cr-content which is consistent with the electrical studies. Electrical resistivity and thermoelectric power data have been analyzed using theoretical models and both suggest that the small polaron hopping (SPH) model is operative in the high temperature insulating region for the entire series of samples.",
author = "Manjunatha, {S. O.} and Ashok Rao and Babu, {P. D.} and Tarachand and Okram, {G. S.}",
year = "2015",
month = "6",
day = "30",
doi = "10.1016/j.physb.2015.06.014",
language = "English",
volume = "475",
pages = "1--9",
journal = "Physica B: Condensed Matter",
issn = "0921-4526",
publisher = "Elsevier",

}

Studies on magneto-resistance, magnetization and thermoelectric power of Cr substituted La0.65Ca0.35Mn1-xCrxO3 (0≤x≤0.07) manganites. / Manjunatha, S. O.; Rao, Ashok; Babu, P. D.; Tarachand; Okram, G. S.

In: Physica B: Condensed Matter, Vol. 475, 309033, 30.06.2015, p. 1-9.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Studies on magneto-resistance, magnetization and thermoelectric power of Cr substituted La0.65Ca0.35Mn1-xCrxO3 (0≤x≤0.07) manganites

AU - Manjunatha, S. O.

AU - Rao, Ashok

AU - Babu, P. D.

AU - Tarachand,

AU - Okram, G. S.

PY - 2015/6/30

Y1 - 2015/6/30

N2 - Abstract A systematic investigation has been carried out on effect of Cr-doping on structural, magneto-resistance, magnetic and thermoelectric power properties of La0.65Ca0.35Mn1-xCrxO3 compounds. Samples were prepared using conventional solid state reaction method. The XRD analysis using Rietveld refinement reveals that the samples are single phased. Temperature dependent electrical resistivity measurements show the existence of the expected metal-insulator transition (TMI) which is followed by a small hump at temperatures lower than TMI. With the application of magnetic field, resistivity of all the samples is found to decrease and TMI is observed to shift towards higher temperature. This is attributed to induced magnetic ordering of the localized t2g spins and increased electron transfer integral between Mn3+/Mn4+ via oxygen by the application of magnetic field. MR% is observed to increase with the increasing Cr concentration. Magnetic studies show that the Curie temperature, TC and magnetic moment decreases with Cr-content which is consistent with the electrical studies. Electrical resistivity and thermoelectric power data have been analyzed using theoretical models and both suggest that the small polaron hopping (SPH) model is operative in the high temperature insulating region for the entire series of samples.

AB - Abstract A systematic investigation has been carried out on effect of Cr-doping on structural, magneto-resistance, magnetic and thermoelectric power properties of La0.65Ca0.35Mn1-xCrxO3 compounds. Samples were prepared using conventional solid state reaction method. The XRD analysis using Rietveld refinement reveals that the samples are single phased. Temperature dependent electrical resistivity measurements show the existence of the expected metal-insulator transition (TMI) which is followed by a small hump at temperatures lower than TMI. With the application of magnetic field, resistivity of all the samples is found to decrease and TMI is observed to shift towards higher temperature. This is attributed to induced magnetic ordering of the localized t2g spins and increased electron transfer integral between Mn3+/Mn4+ via oxygen by the application of magnetic field. MR% is observed to increase with the increasing Cr concentration. Magnetic studies show that the Curie temperature, TC and magnetic moment decreases with Cr-content which is consistent with the electrical studies. Electrical resistivity and thermoelectric power data have been analyzed using theoretical models and both suggest that the small polaron hopping (SPH) model is operative in the high temperature insulating region for the entire series of samples.

UR - http://www.scopus.com/inward/record.url?scp=84934293529&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84934293529&partnerID=8YFLogxK

U2 - 10.1016/j.physb.2015.06.014

DO - 10.1016/j.physb.2015.06.014

M3 - Article

VL - 475

SP - 1

EP - 9

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

SN - 0921-4526

M1 - 309033

ER -