Temperature-dependent valence-band photoemission spectra oMn

We have studied the temperature dependence of the photoemission spectra of La(Formula presented)Sr(Formula presented)MnO(Formula presented)=0.0, 0.2, and 0.4) and found that the spectral line shape dramatically changes in the entire valence-band region, particularly for (Formula presented)=0.2 and 0.4. By contrast, the spectra of La(Formula presented)Sr(Formula presented)CoO(Formula presented) show no significant temperature dependence. From comparison between the temperature- and composition-(Formula presented) dependent spectral changes and the temperature-composition phase diagram of La(Formula presented)Sr(Formula presented)MnO(Formula presented), we suggest that the changes are related to the degree of hole localization on oxygen (Formula presented) orbitals, which is influenced by electron-lattice coupling and magnetic correlations.