Unconventional anisotropic s-Wave superconducting gaps of the LiFeAs Iron-Pnictide superconductor

K. Umezawa, Y. Li, H. Miao, K. Nakayama, Z. H. Liu, P. Richard, T. Sato, J. B. He, D. M. Wang, G. F. Chen, H. Ding, T. Takahashi, S. C. Wang

研究成果: Article査読

146 被引用数 (Scopus)

抄録

We have performed high-resolution angle-resolved photoemission spectroscopy on Fe-based superconductor LiFeAs (T c=18K). We reveal multiple nodeless superconducting (SC) gaps with 2Δ/k BT c ratios varying from 2.8 to 6.4, depending on the Fermi surface (FS). We also succeeded in directly observing a gap anisotropy along the FS with magnitude up to ∼30%. The anisotropy is fourfold symmetric with an antiphase between the hole and electron FSs, suggesting complex anisotropic interactions for the SC pairing. The observed momentum dependence of the SC gap offers an excellent opportunity to investigate the underlying pairing mechanism.

本文言語English
論文番号037002
ジャーナルPhysical review letters
108
3
DOI
出版ステータスPublished - 2012 1 20

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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