Wu, D., Hong, W., Dong, C., Wu, X., Sui, Q., Huang, J., Gao, Q., Li, C., Song, C., Luo, H., Yin, C., Xu, Y., Luo, X., Cai, Y., Jia, J., Wang, Q., Huang, Y., Liu, G., Zhang, S., ... Zhou, X. J. (2020). Spectroscopic evidence of bilayer splitting and strong interlayer pairing in the superconductor KCa2Fe4As4 F2. Physical Review B, 101(22), Article 224508. https://doi.org/10.1103/PhysRevB.101.224508
@article{9d91568da4fe4cfb8ca011377a9cf397,
title = "Spectroscopic evidence of bilayer splitting and strong interlayer pairing in the superconductor KCa2Fe4As4 F2",
abstract = "We report high-resolution laser-based angle-resolved photoemission spectroscopy measurements on a newly discovered iron-based superconductor, KCa2Fe4As4F2 (TC=33.5 K), which consists of stacking FeAs blocks with two FeAs layers separated by insulating Ca2F2 blocks. Bilayer splitting effect is observed for the first time in iron-based superconductors that gives rise to a total of five holelike Fermi surface sheets observed around the Brillouin zone center. Band structure calculations reproduce the observed bilayer splitting by identifying interlayer interorbital interaction between the two FeAs layers within one FeAs block. All the holelike pockets around the zone center exhibit Fermi surface-dependent and nodeless superconducting gap. The gap functions with short-range antiferromagnetic fluctuations are proposed and the gap symmetry can be well understood when the interlayer pairing is considered. The particularly strong interlayer pairing is observed for one of the bands. Our observations provide key information on the role of interlayer coupling and the interlayer pairing in generating superconductivity in iron-based superconductors.",
author = "Dingsong Wu and Wenshan Hong and Chenxiao Dong and Xianxin Wu and Qiangtao Sui and Jianwei Huang and Qiang Gao and Cong Li and Chunyao Song and Hailan Luo and Chaohui Yin and Yu Xu and Xiangyu Luo and Yongqing Cai and Junjie Jia and Qingyan Wang and Yuan Huang and Guodong Liu and Shenjin Zhang and Fengfeng Zhang and Feng Yang and Zhimin Wang and Qinjun Peng and Zuyan Xu and Xianggang Qiu and Shiliang Li and Huiqian Luo and Jiangping Hu and Lin Zhao and Zhou, {X. J.}",
note = "Publisher Copyright: {\textcopyright} 2020 American Physical Society.",
year = "2020",
month = jun,
day = "1",
doi = "10.1103/PhysRevB.101.224508",
language = "English",
volume = "101",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "22",
}
Wu, D, Hong, W, Dong, C, Wu, X, Sui, Q, Huang, J, Gao, Q, Li, C, Song, C, Luo, H, Yin, C, Xu, Y, Luo, X, Cai, Y, Jia, J, Wang, Q, Huang, Y, Liu, G, Zhang, S, Zhang, F, Yang, F, Wang, Z, Peng, Q, Xu, Z, Qiu, X, Li, S, Luo, H, Hu, J, Zhao, L & Zhou, XJ 2020, 'Spectroscopic evidence of bilayer splitting and strong interlayer pairing in the superconductor KCa2Fe4As4 F2', Physical Review B, vol. 101, no. 22, 224508. https://doi.org/10.1103/PhysRevB.101.224508
TY - JOUR
T1 - Spectroscopic evidence of bilayer splitting and strong interlayer pairing in the superconductor KCa2Fe4As4 F2
AU - Wu, Dingsong
AU - Hong, Wenshan
AU - Dong, Chenxiao
AU - Wu, Xianxin
AU - Sui, Qiangtao
AU - Huang, Jianwei
AU - Gao, Qiang
AU - Li, Cong
AU - Song, Chunyao
AU - Luo, Hailan
AU - Yin, Chaohui
AU - Xu, Yu
AU - Luo, Xiangyu
AU - Cai, Yongqing
AU - Jia, Junjie
AU - Wang, Qingyan
AU - Huang, Yuan
AU - Liu, Guodong
AU - Zhang, Shenjin
AU - Zhang, Fengfeng
AU - Yang, Feng
AU - Wang, Zhimin
AU - Peng, Qinjun
AU - Xu, Zuyan
AU - Qiu, Xianggang
AU - Li, Shiliang
AU - Luo, Huiqian
AU - Hu, Jiangping
AU - Zhao, Lin
AU - Zhou, X. J.
N1 - Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - We report high-resolution laser-based angle-resolved photoemission spectroscopy measurements on a newly discovered iron-based superconductor, KCa2Fe4As4F2 (TC=33.5 K), which consists of stacking FeAs blocks with two FeAs layers separated by insulating Ca2F2 blocks. Bilayer splitting effect is observed for the first time in iron-based superconductors that gives rise to a total of five holelike Fermi surface sheets observed around the Brillouin zone center. Band structure calculations reproduce the observed bilayer splitting by identifying interlayer interorbital interaction between the two FeAs layers within one FeAs block. All the holelike pockets around the zone center exhibit Fermi surface-dependent and nodeless superconducting gap. The gap functions with short-range antiferromagnetic fluctuations are proposed and the gap symmetry can be well understood when the interlayer pairing is considered. The particularly strong interlayer pairing is observed for one of the bands. Our observations provide key information on the role of interlayer coupling and the interlayer pairing in generating superconductivity in iron-based superconductors.
AB - We report high-resolution laser-based angle-resolved photoemission spectroscopy measurements on a newly discovered iron-based superconductor, KCa2Fe4As4F2 (TC=33.5 K), which consists of stacking FeAs blocks with two FeAs layers separated by insulating Ca2F2 blocks. Bilayer splitting effect is observed for the first time in iron-based superconductors that gives rise to a total of five holelike Fermi surface sheets observed around the Brillouin zone center. Band structure calculations reproduce the observed bilayer splitting by identifying interlayer interorbital interaction between the two FeAs layers within one FeAs block. All the holelike pockets around the zone center exhibit Fermi surface-dependent and nodeless superconducting gap. The gap functions with short-range antiferromagnetic fluctuations are proposed and the gap symmetry can be well understood when the interlayer pairing is considered. The particularly strong interlayer pairing is observed for one of the bands. Our observations provide key information on the role of interlayer coupling and the interlayer pairing in generating superconductivity in iron-based superconductors.
UR - http://www.scopus.com/inward/record.url?scp=85091015013&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.101.224508
DO - 10.1103/PhysRevB.101.224508
M3 - Article
AN - SCOPUS:85091015013
SN - 2469-9950
VL - 101
JO - Physical Review B
JF - Physical Review B
IS - 22
M1 - 224508
ER -
