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Octahedral distortion induced magnetic anomalies in LaMn0.5Co0.5O3 single crystals

Manna, Kaustuv and Bhadram, Venkata Srinu and Elizabeth, Suja and Narayana, Chandrabhas and Kumar, Anil PS (2014) Octahedral distortion induced magnetic anomalies in LaMn0.5Co0.5O3 single crystals. In: JOURNAL OF APPLIED PHYSICS, 116 (4).

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Official URL: http://dx.doi.org/ 10.1063/1.4891015


Single crystals of LaMn0.5Co0.5O3 belonging to the ferromagnetic-insulator and distorted perovskite class were grown using a four-mirror optical float zone furnace. The as-grown crystal crystallizes into an orthorhombic Pbnm structure. The spatially resolved 2D Raman scan reveals a strain-induced distribution of transition metal (TM)-oxygen (O) octahedral deformation in the as-grown crystal. A rigorous annealing process releases the strain, thereby generating homogeneous octahedral distortion. The octahedra tilt by reducing the bond angle TM-O-TM, resulting in a decline of the exchange energy in the annealed crystal. The critical behavior is investigated from the bulk magnetization. It is found that the ground state magnetic behavior assigned to the strain-free LaMn0.5Co0.5O3 crystal is of the 3D Heisenberg kind. Strain induces mean field-like interaction in some sites, and consequently, the critical exponents deviate from the 3D Heisenberg class in the as-grown crystal. The temperature-dependent Raman scattering study reveals strong spin-phonon coupling and the existence of two magnetic ground states in the same crystal. (C) 2014 AIP Publishing LLC.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER INST PHYSICS, CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 18 Sep 2014 09:11
Last Modified: 18 Sep 2014 09:11
URI: http://eprints.iisc.ac.in/id/eprint/49903

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