Observation of a Van Hove singularity and implication for strong-coupling induced Cooper pairing in KFe2As2

Delong Fang; Xun Shi; Zengyi Du; Pierre Richard; Huan Yang; X. X. Wu; Peng Zhang; Tian Qian; Xiaxin Ding; Zhenyu Wang; T. K. Kim; M. Hoesch; Aifeng Wang; Xianhui Chen; Jiangping Hu; Hong Ding; Hai Hu Wen

doi:10.1103/PhysRevB.92.144513

Observation of a Van Hove singularity and implication for strong-coupling induced Cooper pairing in KFe2As2

Delong Fang, Xun Shi, Zengyi Du, Pierre Richard, Huan Yang, X. X. Wu, Peng Zhang, Tian Qian, Xiaxin Ding, Zhenyu Wang, T. K. Kim, M. Hoesch, Aifeng Wang, Xianhui Chen, Jiangping Hu, Hong Ding, Hai Hu Wen

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摘要

Scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy have been investigated on single-crystal samples of KFe2As2. A Van Hove singularity (VHS) has been directly observed just a few meV below the Fermi level (EF) of superconducting KFe2As2, which locates in the middle of the principal axes of the first Brillouin zone. The majority of the density of states at EF, mainly contributed by the proximity effect of the saddle point to EF, is nongapped in the superconducting state. Our observation of the ungapped feature of the density of states due to the VHS points, while providing consistent explanations to many exotic behaviors previously observed in this material, suggests Cooper pairing induced by a strong-coupling mechanism.

源语言	英语
文章编号	144513
期刊	Physical Review B - Condensed Matter and Materials Physics
卷	92
期	14
DOI	https://doi.org/10.1103/PhysRevB.92.144513
出版状态	已出版 - 27 10月 2015
已对外发布	是

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Fang, D., Shi, X., Du, Z., Richard, P., Yang, H., Wu, X. X., Zhang, P., Qian, T., Ding, X., Wang, Z., Kim, T. K., Hoesch, M., Wang, A., Chen, X., Hu, J., Ding, H., & Wen, H. H. (2015). Observation of a Van Hove singularity and implication for strong-coupling induced Cooper pairing in KFe2As2. Physical Review B - Condensed Matter and Materials Physics, 92(14), 文章 144513. https://doi.org/10.1103/PhysRevB.92.144513

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title = "Observation of a Van Hove singularity and implication for strong-coupling induced Cooper pairing in KFe2As2",

abstract = "Scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy have been investigated on single-crystal samples of KFe2As2. A Van Hove singularity (VHS) has been directly observed just a few meV below the Fermi level (EF) of superconducting KFe2As2, which locates in the middle of the principal axes of the first Brillouin zone. The majority of the density of states at EF, mainly contributed by the proximity effect of the saddle point to EF, is nongapped in the superconducting state. Our observation of the ungapped feature of the density of states due to the VHS points, while providing consistent explanations to many exotic behaviors previously observed in this material, suggests Cooper pairing induced by a strong-coupling mechanism.",

author = "Delong Fang and Xun Shi and Zengyi Du and Pierre Richard and Huan Yang and Wu, {X. X.} and Peng Zhang and Tian Qian and Xiaxin Ding and Zhenyu Wang and Kim, {T. K.} and M. Hoesch and Aifeng Wang and Xianhui Chen and Jiangping Hu and Hong Ding and Wen, {Hai Hu}",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

month = oct,

day = "27",

doi = "10.1103/PhysRevB.92.144513",

language = "English",

volume = "92",

journal = "Physical Review B - Condensed Matter and Materials Physics",

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Fang, D, Shi, X, Du, Z, Richard, P, Yang, H, Wu, XX, Zhang, P, Qian, T, Ding, X, Wang, Z, Kim, TK, Hoesch, M, Wang, A, Chen, X, Hu, J, Ding, H & Wen, HH 2015, 'Observation of a Van Hove singularity and implication for strong-coupling induced Cooper pairing in KFe2As2', Physical Review B - Condensed Matter and Materials Physics, 卷 92, 号码 14, 144513. https://doi.org/10.1103/PhysRevB.92.144513

TY - JOUR

T1 - Observation of a Van Hove singularity and implication for strong-coupling induced Cooper pairing in KFe2As2

AU - Fang, Delong

AU - Shi, Xun

AU - Du, Zengyi

AU - Richard, Pierre

AU - Yang, Huan

AU - Wu, X. X.

AU - Zhang, Peng

AU - Qian, Tian

AU - Ding, Xiaxin

AU - Wang, Zhenyu

AU - Kim, T. K.

AU - Hoesch, M.

AU - Wang, Aifeng

AU - Chen, Xianhui

AU - Hu, Jiangping

AU - Ding, Hong

AU - Wen, Hai Hu

PY - 2015/10/27

Y1 - 2015/10/27

N2 - Scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy have been investigated on single-crystal samples of KFe2As2. A Van Hove singularity (VHS) has been directly observed just a few meV below the Fermi level (EF) of superconducting KFe2As2, which locates in the middle of the principal axes of the first Brillouin zone. The majority of the density of states at EF, mainly contributed by the proximity effect of the saddle point to EF, is nongapped in the superconducting state. Our observation of the ungapped feature of the density of states due to the VHS points, while providing consistent explanations to many exotic behaviors previously observed in this material, suggests Cooper pairing induced by a strong-coupling mechanism.

AB - Scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy have been investigated on single-crystal samples of KFe2As2. A Van Hove singularity (VHS) has been directly observed just a few meV below the Fermi level (EF) of superconducting KFe2As2, which locates in the middle of the principal axes of the first Brillouin zone. The majority of the density of states at EF, mainly contributed by the proximity effect of the saddle point to EF, is nongapped in the superconducting state. Our observation of the ungapped feature of the density of states due to the VHS points, while providing consistent explanations to many exotic behaviors previously observed in this material, suggests Cooper pairing induced by a strong-coupling mechanism.

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U2 - 10.1103/PhysRevB.92.144513

DO - 10.1103/PhysRevB.92.144513

M3 - Article

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SN - 1098-0121

VL - 92

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

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Observation of a Van Hove singularity and implication for strong-coupling induced Cooper pairing in KFe2As2

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