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Structural and magnetotransport studies of magnetic ion doping for monovalent-doped LaMnO3 manganites

Published online by Cambridge University Press:  04 June 2014

Dinesh Varshney  and
Neha Dodiya
Dinesh Varshney*
Affiliation:
Materials Science Laboratory, School of Physics, Vigyan Bhawan, Devi Ahilya University, Indore 452001, India
Neha Dodiya
Affiliation:
Materials Science Laboratory, School of Physics, Vigyan Bhawan, Devi Ahilya University, Indore 452001, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this paper, we report the structural, electrical, and magnetic properties of polycrystalline La0.85–xSmxNa0.15MnO3 (x = 0.05, 0.1, 0.15) manganites. Rietveld refinement of x-ray data infers that doped manganite compounds possess a rhombohedrally distorted structure (space group $R\bar 3C$). Both lattice parameter and unit cell volume decrease and a systematic change in both Mn–O–Mn bond angle and tolerance factor is observed with Sm content. Resistivity measurements discern metal–insulator transition (TP). For x = 0.15 sample, a double metal–insulator transition with a single ferromagnetic transition is depicted. All samples exhibit extrinsic magnetoresistance (MR) effect. A large value of MR of 65% (253 K, 8 T) is associated with grain and grain boundary formation. The highest low-field MR of 23% (12 K, 2 T) and 35.2% (23 K, 2 T) for x = 0.05 and 0.1 is observed. The electronic and magnetic inhomogeneities induced by Sm and nonmagnetic metal Na phases account for MR properties.

Keywords

magnetic materialx-ray diffractioncrystal structureelectrical properties
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 10 , 28 May 2014 , pp. 1183 - 1198
Copyright
Copyright © Materials Research Society 2014 

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References

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