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The low-temperature spin dynamics of doped manganites have been analyzedwithin a tight-binding model, the parameters of which are estimated by mappingthe results of ab initio density functional calculations onto the model. Thisapproach is found to provide a good description of the spin dynamics of thedoped manganites, observed earlier within the ab initio calculations. Ouranalysis not only provides some insight into the roles of the eg and the t2gstates but also indicates that the oxygen p states play an important role inthe spin dynamics. This may cast doubt on the adaptability of the conventionalmodel Hamiltonian approaches to the analysis of spin dynamics of dopedmanganites.Comment: 12 pages; Includes 5 figure

physical review. b, condensed matter

Low-temperature spin dynamics of doped manganites: Roles of Mn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>t</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi>g</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>,</mml:mo></mml:math>Mn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mi>g</mml:mi></mml:mrow></mml:msub></mml:mrow…

Low-temperature spin dynamics of doped manganites: Roles of Mnt2g,Mneg