Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.047002
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Funding
- JSPS
- TRIP-JST
- CREST-JST
- MEXT of Japan
- Chinese Academy of Sciences
- NSF
- Ministry of Science and Technology of China
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [800641] Funding Source: National Science Foundation
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We have performed high-resolution angle-resolved photoemission spectroscopy on heavily overdoped KFe2As2 (transition temperature T-c = 3 K). 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; T-c = 37 K), 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-T-c superconductivity of Ba1-xKxFe2As2 and suggests that the interband scattering via the antiferromagnetic wave vector essentially controls the Tc value in the overdoped region.
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