NDLI: Lanthanum Deficiency Effect on the Structural, Magnetic, and Transport Properties of the La$_{0.8−x }$□$_{ x }$Ca$_{0.2}$MnO$

Content Provider	Springer Nature Link
Author	Skini, R. Khlifi, M. Dhahri, E. Hlil, E. K.
Copyright Year	2013
Abstract	The La$_{0.8−x }$□$_{ x }$Ca$_{0.2}$MnO$_{3}$ compounds were prepared by the solid-state reaction with 0.00≤x≤ 0.20. Morphologic, X-ray diffraction (XRD), magnetic, and electrical measurements were performed to examine the effect of the lanthanum deficiency on the physical properties of these materials. The scanning electron microscopy shown the existence of a secondary phase attributed to the Mn$_{3}$O$_{4}$ oxide. The XRD data have been analyzed by the Rietveld refinement technique. We have found that all samples crystallize in an orthorhombic symmetry with Pnma space group and the unit cell volume decreases with lanthanum deficiency. A magnetization versus temperature study has shown that all samples exhibit a magnetic transition from ferromagnetic (FM) to paramagnetic (PM) phase with increasing temperature. The Curie temperature T $_{C}$ increases with the lanthanum deficiency from 236 K to 247 K for the samples x=0.00 and x=0.20, respectively. Moreover, the temperature dependence of electrical resistivity shows a metal–insulator transition at T $_{ ρ }$ for all samples which increase with vacancy rate. The electrical resistivity is fitted with the phenomenological percolation model, which is based on the phase segregation of ferromagnetic metallic clusters and paramagnetic insulating regions. Thus, show that the conduction mechanist was explained by the electron–electron and electron–phonon scattering process at low temperature and by small polaron hopping at high temperature. Furthermore, we found that the estimated results are in good agreement with experimental data.
Starting Page	247
Ending Page	256
Page Count	10
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	27
Issue Number	1
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2013-05-23
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lanthanum deficiency Rietveld refinement Magnetic Percolation theory Strongly Correlated Systems, Superconductivity Magnetism, Magnetic Materials Condensed Matter Physics Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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