Thermal and Magnetocaloric Properties of La0.7Sr0.3 – xBaxMnO3 Manganites

• Published in: Physics of the solid state Vol. 64; no. 2; pp. 38 - 42
• Main Authors: Gadzhiev, A. B., Gamzatov, A. G., Batdalov, A. B., Khurshilova, Z. A., Aliev, A. M.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-02-2022; Springer Nature B.V
• Subjects: Crystal lattices; Heat transfer; Magnetic properties; Manganites; Photon scatter; Physics; Physics and Astronomy; Solid State Physics; Substitutes; Thermal conductivity; Thermal diffusivity; Thermophysical properties; heat capacity; phase transitions; thermal diffusivity; thermal conductivity; magnetocaloric effect; manganites
• ISSN: 1063-7834; 1090-6460
• DOI: 10.1134/S106378342201005X

The results of studying the effect produced by the partial substitution of Sr
2+
ions by Ba
2+
ions on the thermophysical and magnetocaloric properties of La
0.7
Sr
0.3 –

x
Ba
x
MnO
3
manganite (
x
= 0; 0.02; 0.05, and 0.10) within a temperature range of 100–400 K in a magnetic field of up to 1.8 T are submitted. It has been shown that such substitution leads to an essential decrease in
T
С
. In the behavior of the thermal diffusivity η(
Т
) and thermal conductivity κ(
Т
) near
T
С
, there occur the minima associated with the scattering of photons on both local crystal lattice distortions and spin fluctuations. Absolute thermal conductivity values descend with an increase in the disorder parameter. The magnetocaloric effect exhibits a weak dependence on the substitution level (
x
).