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A Raman study of the temperature-induced low-to-intermediate-spin state transition in LaCoO3

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dc.contributor.author Seikeh, Md Motin
dc.contributor.author Sudheendra, L
dc.contributor.author Narayana, Chandrabhas
dc.contributor.author Rao, C N R
dc.date.accessioned 2012-11-23T10:50:50Z
dc.date.available 2012-11-23T10:50:50Z
dc.date.issued 2004-11-12
dc.identifier 0022-2860 en_US
dc.identifier.citation Journal of Molecular Structure 706(1-3), 121-126 (2004) en_US
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/10572/1061
dc.description Restricted Access en_US
dc.description.abstract The effect of the thermally induced spin-state transition on the phonon mode behavior of LaCoO3 has been investigated by using Raman spectroscopy. The number of observed Raman modes is larger than the number predicted by group theory for a rhombohedrally distorted perovskite structure with the space group R (3) over barc. There is a strong similarity between the Raman spectrum of LaCoO3 and LaMnO3 at ambient conditions due to the Jahn-Teller (J-T) distortion associated with the intermediate-spin (IS) state of Co3+. The J-T distortion splits the external mode associated with La-O vibration into a doublet above the spin-state transition temperature. There is an increase in the anharmonic coupling between the one-phonon states with increase in temperature above the transition temperature, due to the gradual increase in the population of Co3+ in the IS state. (C) 2004 Elsevier B.V. All rights reserved. en_US
dc.description.uri http://dx.doi.org/10.1016/j.molstruc.2004.03.058 en_US
dc.language.iso en en_US
dc.publisher Elsevier Science BV en_US
dc.rights © 2004 Elsevier BV en_US
dc.subject cobaltate en_US
dc.subject spin-state transition en_US
dc.subject intermediate-spin state en_US
dc.subject Jahn-Teller distortion en_US
dc.subject Raman scattering en_US
dc.subject Magnetic-Susceptibility en_US
dc.subject Electronic-Structure en_US
dc.subject Equilibria en_US
dc.subject Phonons en_US
dc.title A Raman study of the temperature-induced low-to-intermediate-spin state transition in LaCoO3 en_US
dc.type Article en_US


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