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Abstract
We have investigated orbital character and electron correlation effects on Fermi surfaces in the hole-overdoped iron pnictide superconductor KFe2As2, which shows a low Tc of ~4 K, by angle-resolved photoemission spectroscopy. From the polarization-dependence of the ARPES spectra, we have determined the orbital character of each Fermi surface. Electron mass renormalization of each band is quantitatively consistent with de Haas-van Alphen results. The outer beta and middle zeta Fermi surfaces show large renormalization factor of m*/mb ~6-7, while the inner Fermi surface has a smaller factor m*/mb ~2. Middle hole Fermi surface zeta has strong three-dimensionality compared to other Fermi surfaces, indicating the d3z2-r2 orbital character, which may be related to the octet-line recently observed by laser ARPES. The observed orbital-dependent mass renormalization would give constraints on the pairing mechanism with line nodes of this system.
Highlights
In contrast to the d-wave superconducting gaps in the high-Tc cuprate superconductors, experimental results on most of the iron-pnictide superconductors have indicated that superconducting gaps are nodeless and on the entire Fermi surfaces (FSs) [1]
We have investigated orbital character and electron correlation effects on Fermi surfaces in the hole-overdoped iron pnictide superconductor KFe2As2, which shows a low Tc of ∼4 K, by angle-resolved photoemission spectroscopy
Middle hole Fermi surface ζ has strong three-dimensionality compared to other Fermi surfaces, indicating the d3z2−r2 orbital character, which may be related to the “octet-line nodes” recently observed by laser angle-resolved photoemission (ARPES)
Summary
In contrast to the d-wave superconducting gaps in the high-Tc cuprate superconductors, experimental results on most of the iron-pnictide superconductors have indicated that superconducting gaps are nodeless and on the entire Fermi surfaces (FSs) [1]. We have investigated orbital character and electron correlation effects on Fermi surfaces in the hole-overdoped iron pnictide superconductor KFe2As2, which shows a low Tc of ∼4 K, by angle-resolved photoemission spectroscopy. Middle hole Fermi surface ζ has strong three-dimensionality compared to other Fermi surfaces, indicating the d3z2−r2 orbital character, which may be related to the “octet-line nodes” recently observed by laser ARPES.
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