Magnetic and transport behaviors of Co substitution in La0.7Sr0.3MnO3 perovskite

The magnetic and electrical properties of the substituted La0.7Sr0.3Mn1-xCoxO3 perovskite (0 ≤ x ≤ 1) were studied. Analysis of the average spin value obtained from inverse magnetic susceptibility using Curie–Weiss law for the samples suggested Co4+ ions were in the high spin state, whereas the spin...

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Bibliographic Details
Published in:Journal of alloys and compounds 2022-08, Vol.911, p.164967, Article 164967
Main Authors: Ngan, L.T.T., Dang, N.T., Phuc, N.X., Bau, L.V., Dang, N.V., Manh, D.H., Nam, P.H., Nguyen, L.H., Phong, P.T.
Format: Article
Language:English
Subjects:
Cobaltites
Conduction mechanism
Electrical properties
Electrical transport
Empirical equations
Magnetic permeability
Magnetic properties
Magnons
Manganites
Perovskites
Spin state
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Summary:The magnetic and electrical properties of the substituted La0.7Sr0.3Mn1-xCoxO3 perovskite (0 ≤ x ≤ 1) were studied. Analysis of the average spin value obtained from inverse magnetic susceptibility using Curie–Weiss law for the samples suggested Co4+ ions were in the high spin state, whereas the spin state of Co3+ ions transformed from high spin to intermediate-spin state at x= 0.8. The metallic conduction behavior of the x = 0 and x = 1 samples was analyzed using the empirical equation ρt=ρ0+ρ2T2+ρ4.5T4.5, reflecting the importance of electron–magnon scattering effects similarly to other manganites. All the other samples displayed semiconductor-like behavior throughout the studied temperature range. The resistivity data in semiconducting La0.7Sr0.3Mn1-xCoxO3 could be fitted to the model of variable range hopping, and both hopping distance and average hopping energy reduced with increasing doped Co concentration. •Successful synthesis of high quality La0.7Sr0.3Mn1-xCoxO3 (0 ≤ x ≤ 1) system using solid state reaction method.•The magnetic and electro-transport of system was systematically studied in the whole doping range.•The strong competition between the DE and SE interactions in Co/Mn ions gives rise to different spin states of Co3+ and Co4+ ions in the system.•The electrical transport is investigated using various models.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2022.164967