Structural and magnetic characterisation of the perovskite oxides La0.7Ca0.3−x
NaxMnO3

• Authors: Anowar Tozri , Moez Bejar , Essebti Dhahri , EL Hlil
• Languages of publication: EN

Abstracts

EN

X-ray powder diffraction (XRD) and magnetic measurements were performed in order to investigate the effect of Na+ ion substitution for Ca2+ ions on the crystallographic structure, the character of magnetic ordering, and the effect of transition temperature in La0.7Ca0.3−x
NaxMnO3 manganites series (0 ⩽ × ⩽ 0.2). All samples crystallise in an orthorhombic structure with the Pnma space group. We have found a strong dependence of structural and magnetic properties on the cation-size disorder parameter σ
2. The temperature dependence of magnetization of all samples obeys the Bloch T
3/2 law. The values of the spin wave constant at low temperature B increase with the increase of x and the Curie temperature decreases. It is concluded that the substitution of Ca by Na+ ions causes a decrease in total exchange integral Aof the samples.

Keywords

EN

manganites; Jahn-Teller effect; charge-ordered; ferromagnetic; cation-size disorder

Discipline

• 71.70.Gm: Exchange interactions
• 74.25.Ha: Magnetic properties including vortex structures and related phenomena(for vortices, magnetic bubbles, and magnetic domain structure, see 75.70.Kw)
• 75.30.Ds: Spin waves(for spin-wave resonance, see 76.50.+g)
• 75.30.Cr: Saturation moments and magnetic susceptibilities
• 75.47.Lx: Magnetic oxides

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2009
• Volume: 7
• Issue: 1
• Pages: 89-95

Dates

published

1 - 3 - 2009

online

8 - 1 - 2009

Contributors

author

Anowar Tozri

• Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, B.P 802, Sfax, 3018, Tunisie

author

Moez Bejar

• Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, B.P 802, Sfax, 3018, Tunisie

author

Essebti Dhahri

• Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, B.P 802, Sfax, 3018, Tunisie

author

EL Hlil

• Laboratoire de Cristallographie, CNRS, 25 avenue des Martyrs, B.P 166, 3804, Grenoble Cedex 9, France

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Identifiers

DOI

10.2478/s11534-008-0147-5