Abstract This paper presents a microscopic theory to explain different Raman modes of La0.5Ca0.5MnO3 based on the electronic Hamiltonian of the Kondo lattice model, which adds phonon interaction to the hybridization between the conduction electrons of the system and the l-electrons. The spectral density is calculated by the Green function technique of Zubarev at zero wave vector and in the low temperature limit. It finds that there are three Raman-active modes and the spectral densities of these modes are substantially influenced by model parameters such as the position of l-level ($\varepsilon$JT), the effective electron--phonon coupling strength (g) and the hybridization parameter (v). Finally, the intensity changes of those peaks are investigated.
Received: 30 July 2008
Revised: 25 December 2008
Accepted manuscript online:
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