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Weak-coupling superconductivity in electron-doped NaFe0.95Co0.05As revealed by ARPES

DOI: 10.1103/PhysRevB.86.214508 DOI Help

Authors: S. Thirupathaiah (Leibniz-Institute for Solid State and Materials Research Dresden) , D. V. Evtushinsky (Leibniz-Institute for Solid State and Materials Research Dresden) , J. Maletz (Leibniz-Institute for Solid State and Materials Research Dresden) , V. B. Zabolotnyy (Leibniz-Institute for Solid State and Materials Research Dresden) , A. A. Kordyuk (Leibniz-Institute for Solid State and Materials Research Dresden; Diamond Light Source) , T. K. Kim (Diamond Light Source) , S. Wurmehl (Leibniz-Institute for Solid State and Materials Research Dresden; Technische Universität Dresden) , M. Roslova (Leibniz-Institute for Solid State and Materials Research Dresden; Moscow State University) , I. Morozov (Leibniz-Institute for Solid State and Materials Research Dresden; Moscow State University) , B. Buechner (Leibniz-Institute for Solid State and Materials Research Dresden; Technische Universität Dresden) , S. V. Borisenko (Leibniz-Institute for Solid State and Materials Research Dresden)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 86 (21)

State: Published (Approved)
Published: December 2012

Abstract: We report a systematic study on the electronic structure and superconducting (SC) gaps in electron-doped NaFe0.95Co0.05As superconductor using angle-resolved photoemission spectroscopy. Holelike Fermi sheets are at the zone center and electronlike Fermi sheets are at the zone corner, and are mainly contributed by xz and yz orbital characters. Our results reveal a ?KBTc in the range of 1.8–2.1, suggesting a weak-coupling superconductivity in these compounds. Gap closing above the transition temperature (Tc) shows the absence of pseudogaps. Gap evolution with temperature follows the BCS gap equation near the ?, Z, and M high symmetry points. Furthermore, an almost isotropic superconductivity along the kz direction in the momentum space is observed by varying the excitation energies.

Subject Areas: Physics


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