Absence of holelike Fermi surface in superconducting K0.8Fe1.7Se2 revealed by ARPES

Details Absence of holelike Fermi surface in superconducting K0.8Fe1.7Se2 revealed by ARPES Absence of holelike Fermi surface in superconducting K0.8Fe1.7Se2 revealed by ARPES

2010-12-29

arxiv.org/abs/1012.6017v1

Physical Review Letters 106, 187001 (2011)

Physics

Condensed Matter

Superconductivity

4 figures

Scientific paper

We have performed an angle-resolved photoemission spectroscopy study of the new iron-based superconductor K0.8Fe1.7Se2 (Tc ~ 30 K). Clear band dispersion is observed with the overall bandwidth renormalized by a factor of 2.5 compared to our local density approximation calculations, indicating relatively strong correlation effects. Only an electronlike band crosses the Fermi energy, forming a nearly circular Fermi surface (FS) at M ({\pi}, 0). The holelike band at {\Gamma} sinks ~ 90 meV below the Fermi energy, with an indirect band gap of 30 meV to the bottom of the electronlike band. The observed FS topology in this superconductor favors ({\pi}, {\pi}) inter-FS scattering between the electronlike FSs at the M points, in sharp contrast with other iron-based superconductors which favor ({\pi}, 0) inter-FS scattering between holelike and electronlike FSs.

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