|
Magnetism
Nonuniform paramagnetic state in nonstoichiometric lanthanum manganites La$_{1-x}$Mn$_{1-y}$O$_{3}$
T. I. Arbuzova, S. V. Naumov Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, Ekaterinburg
Abstract:
The magnetic properties of nonstoichiometric lanthanum manganites La$_{1-x}$Mn$_{1-y}$O$_{3}$ have been studied in the temperature range 80 K $<T<$ 650 K. The Curie temperature $T_C$ changes nonmonotonically as the number of Mn$^{4+}$ ions increases. In the paramagnetic region, there exist isolated Mn ions and magnetic polarons which can be conserved to $T\le$ 4$T_{C}$, independent of the lattice symmetry. In the $T_{C}<T<T_{\operatorname{pol}}$ region, the temperature dependences of the magnetic susceptibility are nonlinear and can be described by the Curie law with a temperature-dependent Curie constant $C$. The sample has been prepared having a composition near the
O' $\to$ O structural transition; the spontaneous magnetization of the sample at $T\le$ 1.6$T_{C}$ is associated to correlated polarons forming due to the double exchange in chains of the $E$-type antiferromagnetic phase.
Received: 28.10.2015
Citation:
T. I. Arbuzova, S. V. Naumov, “Nonuniform paramagnetic state in nonstoichiometric lanthanum manganites La$_{1-x}$Mn$_{1-y}$O$_{3}$”, Fizika Tverdogo Tela, 58:6 (2016), 1080–1085; Phys. Solid State, 58:6 (2016), 1115–1120
Linking options:
https://www.mathnet.ru/eng/ftt9946 https://www.mathnet.ru/eng/ftt/v58/i6/p1080
|
|