Temperature-dependent x-ray absorption spectroscopy of colossal magnetoresistive perovskites

The temperature dependence of the O K-edge pre-edge structure in the x-ray absorption spectra of the perovskites La(1-x)A(x)MnO(3) (A=Ca,Sr; x=0.3,0.4) reveals a correlation between the disappearance of the splitting in the pre-edge region and the presence of Jahn-Teller distortions. The different magnitudes of the distortions for different compounds are proposed to explain some dissimilarities in the line shapes of the spectra taken above the Curie temperature.