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Effects of magnetic doping and temperature dependence of phonon dynamics in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>CaFe</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Co</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:mtext>AsF</mml:mtext></mml:mrow></mml:math>compounds (<mml:math xmlns:mml="http://www.w3.org/1998/Math/…
We report detailed measurements of composition as well as temperature dependence of the phonon density of states in a new series of FeAs compounds with composition ${\text{CaFe}}_{1\ensuremath{-}x}{\text{Co}}_{x}\text{AsF}$ $(x=0,0.06,0.12)$. The electronic-structure calculations for these compounds show that bands near the Fermi level are mainly formed by $\text{Fe}\text{ }3d$ states, which is …