Influence of lattice distortion on the Curie temperature and spin-phonon coupling in LaMn${}_{0.5}$Co${}_{0.5}$O${}_3$

Abstract

Two distinct ferromagnetic phases of LaMn${}_{0.5}$Co${}_{0.5}$O${}_3$ having monoclinic structure with distinct physical properties have been studied. The ferromagnetic ordering temperature ${\text{T}}_c$ is found to be different for both the phases. The origin of such contrasting characteristics is assigned to the changes in the distance(s) and angle(s) between Mn - O - Co resulting from distortions observed from neutron diffraction studies. Investigations on the temperature dependent Raman spectroscopy provide evidence for such structural characteristics, which affects the exchange interaction. The difference in B-site ordering which is evident from the neutron diffraction is also responsible for the difference in ${\text{T}}_c$. Raman scattering suggests the presence of spin-phonon coupling for both the phases around the ${\text{T}}_c$. Electrical transport properties of both the phases have been investigated based on the lattice distortion.

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References in corpus (2)

• Cationic ordering control of magnetization in Sr2FeMoO6 double perovskite
• Local electronic structure and magnetic properties of LaMn0.5Co0.5O3 studied by x-ray absorption and magnetic circular dichroism spectroscopy

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