Band structure and fermi surface of an extremely overdoped iron-based superconductor KFe2As2

T. Sato, K. Nakayama, Y. Sekiba, P. Richard, Y. M. Xu, S. Souma, T. Takahashi, G. F. Chen, J. L. Luo, N. L. Wang, H. Ding

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178 Citations (Scopus)

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 languageEnglish
Article number047002
JournalPhysical review letters
Volume103
Issue number4
DOIs
Publication statusPublished - 2009 Aug 6

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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