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首页> 外文期刊>Physical review, B. Condensed matter and materials physics >Franck-Condon higher order lattice excitations in the LaFe_(1-x)Cr_xO_3 (x=0, 0.1, 0.5, 0.9,1.0) perovskites due to Fe-Cr charge transfer effects
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Franck-Condon higher order lattice excitations in the LaFe_(1-x)Cr_xO_3 (x=0, 0.1, 0.5, 0.9,1.0) perovskites due to Fe-Cr charge transfer effects

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摘要

First and higher order lattice excitations in the B-site disordered perovskites LaFe_(1-x)Cr_xO_3 (x=0, 0.1, 0.5, 0.9, and 1) and La_(0.835)Sr_(0.165)Fe_(0.5)Cr_(0.5)O_(3-δ) are investigated using temperature dependent and polarized inelastic light scattering λ=515 nm (2.41 eV) and 676 nm (1.83 eV) on oriented crystallites. A peak at approximately 2.4 eV in the imaginary part of the dielectric function of LaFe_(0.5)Cr_(0.5)O_3 is assigned to a charge transfer from Fe~(3+) (d~5) to Cr~(3+) (d~3) ions, coupled with the appearance of an intense A_g-like mode at approximately 700 cm~(-1) in the Raman data. This excitation is identified as a symmetric oxygen breathing mode activated by the Fe-Cr charge transfer through an orbital coupling mechanism. Higher order scattering (up to seventh order) of the intrinsic Raman active symmetric breathing mode is also explained by an orbital-mediated electron-phonon coupling, similar to the Franck-Condon effect observed in the Jahn-Teller active-perovskite-structured manganite LaMaO_3. These results show that the Franck-Condon mechanism is a more common mechanism for resonant higher order scattering in solids than previously believed and propose the LaFe_(1-x)Cr_xO_3 system as a model system for electron-phonon coupling and higher order Raman scattering in solids.

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