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Magnetic and transport behaviors of Co substitution in La0.7Sr0.3MnO3 perovskite
Magnetic and transport behaviors of Co substitution in La0.7Sr0.3MnO3 perovskite
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Date
2022
Authors
L.T.T. Ngan
N.T. Dang
N.X. Phuc
L.V. Bau
N.V. Dang
D.H. Manh
P.H. Nam
L.H. Nguyen
P.T. Phong
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Abstract
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 , 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.
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Keywords
Manganites,
CobaltitesSpin state,
Electrical transport,
Conduction mechanism