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Electronic structure of newly synthesized single crystals of calcium ironarsenide doped with sodium with Tc ranging from 33 to 14 K has been determinedby angle-resolved photoemission spectroscopy (ARPES). The measured banddispersion is in general agreement with theoretical calculations, nonethelessimplies absence of Fermi surface nesting at antiferromagnetic vector. A clearlydeveloping below Tc strongly band-dependant superconducting gap has beenrevealed for samples with various doping levels. BCS ratio for optimal doping,$2\Delta/k_{\rm B}T_{\rm c}=5.5$, is substantially smaller than the numbersreported for related compounds, implying a non-trivial relation betweenelectronic dispersion and superconducting gap in iron arsenides.

Electronic band structure and momentum dependence of the superconducting gap in (Ca, Na)Fe2As2 from angle-resolved photoemission spectroscopy