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

نویسندگان

  • 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
چکیده

We have performed high-resolution angle-resolved photoemission spectroscopy on heavily overdoped KFe_{2}As_{2} (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 Ba_{1-x}K_{x}Fe_{2}As_{2} (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 Ba_{1-x}K_{x}Fe_{2}As_{2} and suggests that the interband scattering via the antiferromagnetic wave vector essentially controls the T_{c} value in the overdoped region.

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عنوان ژورنال:
  • Physical review letters

دوره 103 4  شماره 

صفحات  -

تاریخ انتشار 2009