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Evidence of electron interaction with an unidentified bosonic mode in superconductor CsCa2Fe4As4F2.
Li, Peng; Liao, Sen; Wang, Zhicheng; Li, Huaxun; Su, Shiwu; Zhang, Jiakang; Chen, Ziyuan; Jiang, Zhicheng; Liu, Zhengtai; Yang, Lexian; Huai, Linwei; He, Junfeng; Cui, Shengtao; Sun, Zhe; Yan, Yajun; Cao, Guanghan; Shen, Dawei; Jiang, Juan; Feng, Donglai.
Afiliação
  • Li P; Shool of Emerging Technology, University of Science and Technology of China, Hefei, 230026, China.
  • Liao S; Shool of Emerging Technology, University of Science and Technology of China, Hefei, 230026, China.
  • Wang Z; Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing, 211189, China.
  • Li H; School of Physics, Zhejiang University, Hangzhou, 310058, China.
  • Su S; Shool of Emerging Technology, University of Science and Technology of China, Hefei, 230026, China.
  • Zhang J; Shool of Emerging Technology, University of Science and Technology of China, Hefei, 230026, China.
  • Chen Z; Shool of Emerging Technology, University of Science and Technology of China, Hefei, 230026, China.
  • Jiang Z; National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026, China.
  • Liu Z; School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230026, China.
  • Yang L; Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201210, China.
  • Huai L; State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, 100084, China.
  • He J; CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China.
  • Cui S; CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China.
  • Sun Z; National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026, China.
  • Yan Y; National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026, China.
  • Cao G; Shool of Emerging Technology, University of Science and Technology of China, Hefei, 230026, China.
  • Shen D; School of Physics, Zhejiang University, Hangzhou, 310058, China.
  • Jiang J; National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026, China.
  • Feng D; School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230026, China.
Nat Commun ; 15(1): 6433, 2024 Jul 31.
Article em En | MEDLINE | ID: mdl-39085266
ABSTRACT
The kink structure in band dispersion usually refers to a certain electron-boson interaction, which is crucial in understanding the pairing in unconventional superconductors. Here we report the evidence of the observation of a kink structure in Fe-based superconductor CsCa2Fe4As4F2 using angle-resolved photoemission spectroscopy. The kink shows an orbital selective and momentum dependent behavior, which is located at 15 meV below Fermi level along the Γ - M direction at the band with dxz orbital character and vanishes when approaching the Γ - X direction, correlated with a slight decrease of the superconducting gap. Most importantly, this kink structure disappears when the superconducting gap closes, indicating that the corresponding bosonic mode (~ 9 ± 1 meV) is closely related to superconductivity. However, the origin of this mode remains unidentified, since it cannot be related to phonons or the spin resonance mode (~15 meV) observed by inelastic neutron scattering. The behavior of this mode is rather unique and challenges our present understanding of the superconducting paring mechanism of the bilayer FeAs-based superconductors.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nat Commun Assunto da revista: BIOLOGIA / CIENCIA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: China
Texto completo
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XML
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nat Commun Assunto da revista: BIOLOGIA / CIENCIA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: China