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Simple band model for La 1− xSr xCoO 3: Evidence from electron spectroscopy
Ist Teil von
Journal of solid state chemistry, 1990, Vol.86 (1), p.50-58
Ort / Verlag
Elsevier Inc
Erscheinungsjahr
1990
Link zum Volltext
Quelle
Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)
Beschreibungen/Notizen
Valence band photoelectron spectra and high resolution electron energy loss spectra for La
1−
x
Sr
x
CoO
3 (
x ≤ 0.5) have been measured. The general appearance and variation with photon energy of the former may be interpreted in terms of the density of states arising from a simple semiempirical tight binding band structure calculation, for reasonable values of Hamiltonian matrix elements. The latter show a highly damped loss feature below 1 eV which may be assigned to a plasma oscillation whose frequency is overestimated by the same calculations, indicating a considerable enhancement of effective mass through correlation. Some care must, however, be taken in these analyses, since the samples show a mild segregation of strontium at the surface.