Universality of superconducting gaps in overdoped Ba0.3K 0.7Fe2As2 observed by angle-resolved photoemission spectroscopy

K. Nakayama, T. Sato, P. Richard, Y. M. Xu, T. Kawahara, K. Umezawa, T. Qian, M. Neupane, G. F. Chen, H. Ding, T. Takahashi

研究成果: Article査読

91 被引用数 (Scopus)

抄録

We have performed angle-resolved photoemission spectroscopy on the overdoped Ba0.3K0.7Fe2As2 superconductor (Tc=22 K). We demonstrate that the superconducting (SC) gap on each Fermi surface (FS) is nearly isotropic whereas the gap value varies from 4.4 to 7.9 meV on different FSs. By comparing with under- and optimally doped Ba1-xKxFe2As2, we find that the gap value on each FS nearly scales with Tc over a wide doping range (0.25≤x≤0.7). Although the FS volume and the SC gap magnitude are strongly doping dependent, the multiple nodeless gaps can be commonly fitted by a single gap function assuming pairing up to the second nearest neighbor, suggesting the universality of the short-range pairing states with the s±-wave symmetry.

本文言語English
論文番号020501
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
83
2
DOI
出版ステータスPublished - 2011 1月 10

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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