Electron-lattice interactions in the perovskite LaFe0.5Cr0.5O3 characterized by optical spectroscopy and LDA+U calculations
Artikel i vetenskaplig tidskrift, 2009

We use resonance Raman scattering (incident photon energies between 1.8 and 4.13 eV), LDA+U calculations, spectroscopic ellipsometry, and oblique IR reflectivity to characterize the strong electron-phonon interactions in the disordered perovskite LaFe0.5Cr0.5O3. When the photon energy coincides with a Cr to Fe Mott-Hubbard transfer gap around 2.4 eV the electron-phonon interaction is manifested by a Franck-Condon effect with exceptional first- and higher order scattering of a local oxygen breathing mode. At higher incident energies we observe a superposition of Franck-Condon scattering and Fröhlich interaction induced infrared active longitudinal optical two-phonon scattering activated mainly by O to Fe charge transfer. Our results establish LaFe0.5Cr0.5O3 as a model compound for research on electron-phonon interactions in strongly correlated complex systems and show that Franck-Condon scattering in complex solids is not limited to Jahn-Teller active compounds.

Författare

Jakob Andreasson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Joakim Holmlund

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Stefan G. Singer

Christopher Knee

Göteborgs universitet

Ralf Rauer

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Benjamin Schulz

Mikael Käll

Chalmers, Teknisk fysik, Bionanofotonik

Michael Rübhausen

Sten Eriksson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Lars Börjesson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Alexander Lichtenstein

Physical Review B - Condensed Matter and Materials Physics

1098-0121 (ISSN)

Vol. 80 7 075103 [5 pages-

Ämneskategorier

Kemi

DOI

10.1103/PhysRevB.80.075103