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By means of first-principle FLAPW-GGA calculations, we have investigated theelectronic properties of the newly discovered layered quaternary systemsSrFeAsF and CaFeAsF as parent phases for a new group of oxygen-free FeAssuperconductors. The electronic bands, density of states, Fermi surfaces,atomic charges, together with Sommerfeld coefficients and molar Pauliparamagnetic susceptibility have been evaluated and discussed in comparisonwith oxyarsenide LaFeAsO - a parent phase for a new class of high-temperature(Tc about 26-56K) oxygen-containing FeAs superconductors. Similarity of ourdata for SrFeAsF and CaFeAsF with the band structure of oxygen-containing FeAssuperconducting materials may be considered as theoretical backgroundspecifying the possibility of superconductivity in these oxygen-free systems.

Band structure of SrFeAsF and CaFeAsF as parent phases for a new group of oxygen-free FeAs superconductors