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

doi:10.1103/PhysRevLett.108.037002

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

150 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
巻	108
号	3
DOI	https://doi.org/10.1103/PhysRevLett.108.037002
出版ステータス	Published - 2012 1月 20

ASJC Scopus subject areas

物理学および天文学（全般）

文献へのアクセス

10.1103/PhysRevLett.108.037002

他のファイルとリンク

引用スタイル

@article{35437217e9524c03b692ea1a5a17caca,

title = "Unconventional anisotropic s-Wave superconducting gaps of the LiFeAs Iron-Pnictide superconductor",

abstract = "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.",

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

year = "2012",

month = jan,

day = "20",

doi = "10.1103/PhysRevLett.108.037002",

language = "English",

volume = "108",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "3",

}

TY - JOUR

T1 - Unconventional anisotropic s-Wave superconducting gaps of the LiFeAs Iron-Pnictide superconductor

AU - Umezawa, K.

AU - Li, Y.

AU - Miao, H.

AU - Nakayama, K.

AU - Liu, Z. H.

AU - Richard, P.

AU - Sato, T.

AU - He, J. B.

AU - Wang, D. M.

AU - Chen, G. F.

AU - Ding, H.

AU - Takahashi, T.

AU - Wang, S. C.

PY - 2012/1/20

Y1 - 2012/1/20

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84860497667&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84860497667&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.108.037002

DO - 10.1103/PhysRevLett.108.037002

M3 - Article

C2 - 22400776

AN - SCOPUS:84860497667

SN - 0031-9007

VL - 108

JO - Physical Review Letters

JF - Physical Review Letters

IS - 3

M1 - 037002

ER -

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

抄録

ASJC Scopus subject areas

文献へのアクセス

他のファイルとリンク

フィンガープリント

引用スタイル