Electronic band structure and momentum dependence of the superconducting gap in Ca1 xNaxFe2As2 from angle resolved photoemission spectroscopy
- Evtushinsky, D.V.
- Zabolotnyy, V.B.
- Harnagea, L.
- Yaresko, A.N.
- Thirupathaiah, S.
- Kordyuk, A.A.
- Maletz, J.
- Aswartham, S.
- Wurmehl, S.
- Rienks, E.
- Follath, R.
- Buechner, B.
- Borisenko, S.V.
DOIAbstract
Electronic structure of newly synthesized single crystals of calcium iron arsenide doped with sodium with Tc ranging from 33 to 14 K has been determined by angle resolved photoemission spectroscopy ARPES . The measured band dispersion is in general agreement with theoretical calculations, nonetheless implies absence of Fermi surface nesting at an antiferromagnetic vector. A clearly developing below Tc strongly band dependant superconducting gap has been revealed for samples with various doping levels. The BCS ratio for optimal doping, 2 amp; 916; kBTc 5.5, is substantially smaller than the numbers observed for related compound
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