Abstract
We have performed high-resolution angle-resolved photoemission spectroscopy on heavily overdoped KFe2As2 (transition temperature Tc=3K). We observed several renormalized bands near the Fermi level with a renormalization factor of 2-4. While the Fermi surface around the Brillouin-zone center is qualitatively similar to that of optimally doped Ba1-xKxFe2As2 (x=0.4; Tc=37K), the Fermi surface topology around the zone corner (M point) is markedly different: the two electron Fermi surface pockets are completely absent due to an excess of hole doping. This result indicates that the electronic states around the M point play an important role in the high-Tc superconductivity of Ba1-xKxFe2As2 and suggests that the interband scattering via the antiferromagnetic wave vector essentially controls the Tc value in the overdoped region.
Original language | English |
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Article number | 047002 |
Journal | Physical review letters |
Volume | 103 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2009 Aug 6 |
ASJC Scopus subject areas
- Physics and Astronomy(all)