|
Magnetism
Magnetic phase transitions in $Ln_{1-x}$Sr$_{x}$Co$_{0.5}$Mn$_{0.5}$O$_{3}$ ($Ln$ = La, Pr, Nd, and Eu)
I. O. Troyanchuka, M. V. Bushinskya, A. N. Chobota, N. V. Tereshkoa, O. S. Mantytskayaa, E. A. Efimovab, V. V. Sikolenkoc, V. M. Dobryanskiid a Scientific-Practical Materials Research Centre of NAS of Belarus, Minsk, Belarus
b Joint Institute for Nuclear Research, Dubna, Moscow region
c Helmholtz Center Berlin, Berlin, Germany
d Belarusian State Agrarian Technical University, Minsk
Abstract:
The system of La$_{1-x}$Sr$_{x}$Co$_{0.5}$Mn$_{0.5}$O$_{3}$ solid solutions have been studied by neutron diffraction and the measurement of the magnetization. The composition with $x$ = 0 has the monoclinic structure (space group $P$2$_{1/n}$); the compositions with 0.15 $\le x\le$ 0.6 are rhombohedral $(R\bar3 c)$, and the composition with $x$ = 0.75 is cubic $(Pm\bar3 n)$. All the compositions with $x\le$ 0.75 are shown to contain a ferromagnetic component. The stoichiometric composition with $x$ = 0.5 undergoes a sharp ferrromagnet–paramagnet transition at 240 K; however, no coherent magnetic contribution to the neutron diffraction has been detected. The magnetic data are interpreted, assuming that the ferromagnetism at $x\le$ 0.15 is due to positive superexchange Co$^{2+}$–O–Mn$^{4+}$ interaction, while, at $x\ge$ 0.25, the superexchange interaction between ions Co$^{3+}$ in a high-spin state and ions Mn$^{4+}$ is responsible for the ferromagnetic component.
Received: 20.06.2016 Revised: 31.08.2016
Citation:
I. O. Troyanchuk, M. V. Bushinsky, A. N. Chobot, N. V. Tereshko, O. S. Mantytskaya, E. A. Efimova, V. V. Sikolenko, V. M. Dobryanskii, “Magnetic phase transitions in $Ln_{1-x}$Sr$_{x}$Co$_{0.5}$Mn$_{0.5}$O$_{3}$ ($Ln$ = La, Pr, Nd, and Eu)”, Fizika Tverdogo Tela, 59:4 (2017), 712–716; Phys. Solid State, 59:4 (2017), 728–732
Linking options:
https://www.mathnet.ru/eng/ftt9609 https://www.mathnet.ru/eng/ftt/v59/i4/p712
|
Statistics & downloads: |
Abstract page: | 24 | Full-text PDF : | 4 |
|