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Magneto-transport and optical properties of La0.7K0.3Mn(1−x)GaxO3 (0 ≤ x ≤ 0.25) ceramics
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Magneto-transport and optical properties of La0.7K0.3Mn(1−x)GaxO3 (0 ≤ x ≤ 0.25) ceramics
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Journal Article
Magneto-transport and optical properties of La0.7K0.3Mn(1−x)GaxO3 (0 ≤ x ≤ 0.25) ceramics
2024
Overview
The effect of gallium doping on the structural, optical, and magneto-transport properties of the La
0.7
K
0.3
Mn
(1−
x
)
Ga
x
O
3
(0 ≤
x
≤ 0.25) ceramics in several magnetic fields (0T–3T) have been synthesized by Pechini sol–gel method. The Rietveld refinements data revealed that all the samples have a rhombohedral structure with the space group R3 ̅c. The SEM images recorded at different magnification levels reveal uniform grain shapes with flat surfaces. The optical properties indicated that the band gap of La
0.7
K
0.3
Mn
(1−
x
)
Ga
x
O
3
(0 ≤
x
≤ 0.25) ceramics was shifted from 3.2 to 3.08 eV with dopant concentration. The magnetic study confirmed that our compounds exhibit a ferromagnetic–paramagnetic transition in the vicinity of the Curie temperature Tc. Moreover, in the electrical part, the resistivity decreased with the Ga content and the metal–insulator transition temperature (
T
M-I
) reached room temperature for
x
= 0.125 under a magnetic field of 3
T
. On the other hand, the magnetoresistance (MR) and temperature coefficient of resistance (TCR) increased with the doping of Ga until a significant maximum (MR = 88%, TCR = 8% K
−1
) around metal–insulator transition
T
M-I
= 300 K for
x
= 0.125 with a magnetic field of 3T.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
Subject
