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Electronic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>LaFeAsO</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>โ</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mtext>F</mml:mtext><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math>from x-ray absorption spectroscopy
We investigated the recently found superconductor ${\text{LaFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$ by x-ray absorption spectroscopy. From a comparison of the $\text{O}\text{ }K$ edge with LDA calculations we find good agreement and are able to explain the structure and changes in the spectra with electron doping. From experimental $\text{Fe}\text{ }{L}_{2,3}$-edge spectra and charge-transfer multiplet calculations โฆ