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Title: Octahedral distortion induced magnetic anomalies in LaMn0.5Co0.5O3 single crystals
Authors: Manna, Kaustuv
Bhadram, Venkata Srinu
Elizabeth, Suja
Narayana, Chandrabhas
Kumar, P. S. Anil
Keywords: Applied Physics
Phonon Raman-Scattering
Issue Date: 2014
Publisher: American Institute of Physics
Citation: Manna, K; Bhadram, VS; Elizabeth, S; Narayana, C; Kumar, PSA, Octahedral distortion induced magnetic anomalies in LaMn0.5Co0.5O3 single crystals. Journal of Applied Physics 2014, 116 (4), 43903
Journal of Applied Physics
Abstract: 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.
Description: Restricted Access
ISSN: 0021-8979
Appears in Collections:Research Articles (Chandrabhas N.)

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