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Two distinct ferromagnetic phases of LaMn$_{0.5}$Co$_{0.5}$O$_{3}$ havingmonoclinic structure with distinct physical properties have been studied. Theferromagnetic ordering temperature $\textit{T}_{c}$ is found to be differentfor both the phases. The origin of such contrasting characteristics is assignedto the changes in the distance(s) and angle(s) between Mn - O - Co resultingfrom distortions observed from neutron diffraction studies. Investigations onthe temperature dependent Raman spectroscopy provide evidence for suchstructural characteristics, which affects the exchange interaction. Thedifference in B-site ordering which is evident from the neutron diffraction isalso responsible for the difference in $\textit{T}_{c}$. Raman scatteringsuggests the presence of spin-phonon coupling for both the phases around the$\textit{T}_{c}$. Electrical transport properties of both the phases have beeninvestigated based on the lattice distortion.

Influence of lattice distortion on the Curie temperature and spin-phonon coupling in LaMn$_{0.5}$Co$_{0.5}$O$_{3}$