Viswanathan, M and Kumar, Anil PS and Bhadram, Venkata Srinu and Narayana, Chandrabhas and Bera, AK and Yusuf, SM (2010) Influence of lattice distortion on the Curie temperature and spin-phonon coupling in LaMn0.5Co0.5O3. In: Journal of Physics: Condensed Matter, 22 (34).
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Two distinct ferromagnetic phases of LaMn0.5Co0.5O3 having monoclinic structure with distinct physical properties have been studied. The ferromagnetic ordering temperature 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 T-c. Raman scattering suggests the presence of spin-phonon coupling for both the phases around the T-c. Electrical transport properties of both the phases have been investigated based on the lattice distortion.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Institute of Physics.|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||06 Sep 2010 11:13|
|Last Modified:||19 Sep 2010 06:15|
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