Tuesday, June 25, 2013

1306.5414 (T. Hishida et al.)

Empirical relationship between x-ray photoemission spectra and
electrical conductivity in a colossal magnetoresistive manganite

T. Hishida, K. Ohbayashi, M. Kobata, E. Ikenaga, T. Sugiyama, K. Kobayashi, M. Okawa, T. Saitoh
By using laboratory x-ray photoemission spectroscopy (XPS) and hard x-ray photoemission spectroscopy (HX-PES) at a synchrotron facility, we report an empirical semi-quantitative relationship between the valence/core-level x-ray photoemission spectral weight and electrical conductivity in La_{1-x}Sr_{x}MnO_{3} as a function of x. In the Mn 2p_{3/2} HX-PES spectra, we observed the shoulder structure due to the Mn^{3+} well-screened state. However, the intensity at x=0.8 was too small to explain its higher electrical conductivity than x=0.0, which confirms our recent analysis on the Mn 2p_{3/2} XPS spectra. The near-Fermi level XPS spectral weight was found to be a measure of the variation of electrical conductivity with x in spite of a far lower energy resolution compared with the energy scale of the quasiparticle (coherent) peak because of the concurrent change of the coherent and incoherent spectral weight.
View original: http://arxiv.org/abs/1306.5414

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