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Fizika Tverdogo Tela, 2021, Volume 63, Issue 12, Pages 2028–2032
DOI: https://doi.org/10.21883/FTT.2021.12.51661.28s
(Mi ftt7910)
 

XXI All-Russian School-Seminar on Condensed Matter Physics (SPFKS-21), Yekaterinburg, March 18-25, 2021
Thermal properties

Thermal and magnetocaloric properties of manganites La$_{0.7}$Sr$_{0.3-x}$Ba$_{x}$MnO$_{3}$

A. B. Gadzhieva, A.G. Gamzatova, A. B. Batdalova, Z. A. Hurshilovab, A. M. Alieva

a Daghestan Institute of Physics after Amirkhanov
b Dagestan State Medical University, Makhachkala
Abstract: The results of a study of the effect of partial substitution of Sr$^{2+}$ ions by Ba$^{2+}$ ions on the thermophysical and magnetocaloric properties of manganite La$_{0.7}$Sr$_{0.3-x}$Ba$_{x}$MnO$_{3}$ ($x$ = 0; 0.02; 0.05 and 0.10) in the temperature range 100–400 K and in a magnetic field up to 1.8 T. It is shown that such a substitution leads to a significant decrease in $T_C$. In the behaviour of the thermal diffusivity $\eta(T)$ and thermal conductivity $\kappa(T)$ near $T_C$, minima were found that are associated with both the scattering of phonons by local distortions of the crystal lattice and by spin fluctuations. The absolute values of thermal conductivity decrease with an increase in the disorder parameter. The magnetocaloric effect exhibits a weak dependence on the substitution level $(x)$.
Keywords: magnetocaloric effect, manganites, phase transitions, heat capacity, thermal diffusivity, thermal conductivity.
Funding agency Grant number
Russian Foundation for Basic Research 20-58-54006
Received: 08.07.2021
Revised: 13.07.2021
Accepted: 16.07.2021
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: A. B. Gadzhiev, A.G. Gamzatov, A. B. Batdalov, Z. A. Hurshilova, A. M. Aliev, “Thermal and magnetocaloric properties of manganites La$_{0.7}$Sr$_{0.3-x}$Ba$_{x}$MnO$_{3}$”, Fizika Tverdogo Tela, 63:12 (2021), 2028–2032
Citation in format AMSBIB
\Bibitem{GadGamBat21}
\by A.~B.~Gadzhiev, A.G.~Gamzatov, A.~B.~Batdalov, Z.~A.~Hurshilova, A.~M.~Aliev
\paper Thermal and magnetocaloric properties of manganites La$_{0.7}$Sr$_{0.3-x}$Ba$_{x}$MnO$_{3}$
\jour Fizika Tverdogo Tela
\yr 2021
\vol 63
\issue 12
\pages 2028--2032
\mathnet{http://mi.mathnet.ru/ftt7910}
\crossref{https://doi.org/10.21883/FTT.2021.12.51661.28s}
\elib{https://elibrary.ru/item.asp?id=46652158}
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