On magnetic ordering in heavily sodium substituted hole doped lanthanum manganites

N. Sethulakshmi; A. N. Unnimaya; I. A. Al-Omari; Salim Al-Harthi; S. Sagar; Senoy Thomas; G. Srinivasan; M. R. Anantharaman

doi:10.1016/j.jmmm.2015.04.092

On magnetic ordering in heavily sodium substituted hole doped lanthanum manganites

N. Sethulakshmi, A. N. Unnimaya, I. A. Al-Omari, Salim Al-Harthi, S. Sagar, Senoy Thomas, G. Srinivasan, M. R. Anantharaman^*

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

Mixed valence manganite system with monovalent sodium substituted lanthanum manganites form the basis of the present work. Lanthanum manganites belonging to the series La_1-xNa_xMnO₃ with x=0.5-0.9 were synthesized using modified citrate gel method. Variation of lattice parameters and unit cell volume with Na concentration were analyzed and the magnetization measurements indicated ferromagnetic ordering in all samples at room temperature. Low temperature magnetization behavior indicated that all samples exhibit antiferromagnetism along with ferromagnetism and it has also been observed that antiferromagnetic ordering dominates ferromagnetic ordering as concentration is increased. Evidence for such a magnetic inhomogeneity in these samples has been confirmed from the variation in Mn³⁺/Mn⁴⁺ ion ratio from X-ray Photoelectron Spectroscopy and from the absorption peak studies using Ferromagnetic Resonance Spectroscopy.

Original language	English
Pages (from-to)	75-82
Number of pages	8
Journal	Journal of Magnetism and Magnetic Materials
Volume	391
DOIs	https://doi.org/10.1016/j.jmmm.2015.04.092
Publication status	Published - Apr 23 2015

Keywords

Lanthanum manganites
Magnetic inhomogeneity
Mixed valency
Monovalent substitution
Na concentration
Oxygen vacancy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2015.04.092

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title = "On magnetic ordering in heavily sodium substituted hole doped lanthanum manganites",

abstract = "Mixed valence manganite system with monovalent sodium substituted lanthanum manganites form the basis of the present work. Lanthanum manganites belonging to the series La1-xNaxMnO3 with x=0.5-0.9 were synthesized using modified citrate gel method. Variation of lattice parameters and unit cell volume with Na concentration were analyzed and the magnetization measurements indicated ferromagnetic ordering in all samples at room temperature. Low temperature magnetization behavior indicated that all samples exhibit antiferromagnetism along with ferromagnetism and it has also been observed that antiferromagnetic ordering dominates ferromagnetic ordering as concentration is increased. Evidence for such a magnetic inhomogeneity in these samples has been confirmed from the variation in Mn3+/Mn4+ ion ratio from X-ray Photoelectron Spectroscopy and from the absorption peak studies using Ferromagnetic Resonance Spectroscopy.",

keywords = "Lanthanum manganites, Magnetic inhomogeneity, Mixed valency, Monovalent substitution, Na concentration, Oxygen vacancy",

author = "N. Sethulakshmi and Unnimaya, {A. N.} and Al-Omari, {I. A.} and Salim Al-Harthi and S. Sagar and Senoy Thomas and G. Srinivasan and Anantharaman, {M. R.}",

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doi = "10.1016/j.jmmm.2015.04.092",

language = "English",

volume = "391",

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T1 - On magnetic ordering in heavily sodium substituted hole doped lanthanum manganites

AU - Sethulakshmi, N.

AU - Unnimaya, A. N.

AU - Al-Omari, I. A.

AU - Al-Harthi, Salim

AU - Sagar, S.

AU - Thomas, Senoy

AU - Srinivasan, G.

AU - Anantharaman, M. R.

PY - 2015/4/23

Y1 - 2015/4/23

N2 - Mixed valence manganite system with monovalent sodium substituted lanthanum manganites form the basis of the present work. Lanthanum manganites belonging to the series La1-xNaxMnO3 with x=0.5-0.9 were synthesized using modified citrate gel method. Variation of lattice parameters and unit cell volume with Na concentration were analyzed and the magnetization measurements indicated ferromagnetic ordering in all samples at room temperature. Low temperature magnetization behavior indicated that all samples exhibit antiferromagnetism along with ferromagnetism and it has also been observed that antiferromagnetic ordering dominates ferromagnetic ordering as concentration is increased. Evidence for such a magnetic inhomogeneity in these samples has been confirmed from the variation in Mn3+/Mn4+ ion ratio from X-ray Photoelectron Spectroscopy and from the absorption peak studies using Ferromagnetic Resonance Spectroscopy.

AB - Mixed valence manganite system with monovalent sodium substituted lanthanum manganites form the basis of the present work. Lanthanum manganites belonging to the series La1-xNaxMnO3 with x=0.5-0.9 were synthesized using modified citrate gel method. Variation of lattice parameters and unit cell volume with Na concentration were analyzed and the magnetization measurements indicated ferromagnetic ordering in all samples at room temperature. Low temperature magnetization behavior indicated that all samples exhibit antiferromagnetism along with ferromagnetism and it has also been observed that antiferromagnetic ordering dominates ferromagnetic ordering as concentration is increased. Evidence for such a magnetic inhomogeneity in these samples has been confirmed from the variation in Mn3+/Mn4+ ion ratio from X-ray Photoelectron Spectroscopy and from the absorption peak studies using Ferromagnetic Resonance Spectroscopy.

KW - Lanthanum manganites

KW - Magnetic inhomogeneity

KW - Mixed valency

KW - Monovalent substitution

KW - Na concentration

KW - Oxygen vacancy

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U2 - 10.1016/j.jmmm.2015.04.092

DO - 10.1016/j.jmmm.2015.04.092

M3 - Article

AN - SCOPUS:84928902022

SN - 0304-8853

VL - 391

SP - 75

EP - 82

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

ER -

On magnetic ordering in heavily sodium substituted hole doped lanthanum manganites

Abstract

Keywords

ASJC Scopus subject areas

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