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Photoemission signature of momentum-dependent hybridization in CeCoIn5

Kurleto, R ; Fidrysiak, M ; Nicolaï, L ; Minár, J ; Rosmus, M ; Walczak, Ł ; Tejeda, A ; Rault, J E ; Bertran, F ; Kądzielawa, A P ; Legut, D ; Gnida, D ; Kaczorowski, D ; Kissner, K ; Reinert, F ; Spałek, J ; Starowicz, P

Physical review. B, 2021-09, Vol.104 (12), p.1 [Periódico revisado por pares]

College Park: American Physical Society

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  • Título:
    Photoemission signature of momentum-dependent hybridization in CeCoIn5
  • Autor: Kurleto, R ; Fidrysiak, M ; Nicolaï, L ; Minár, J ; Rosmus, M ; Walczak, Ł ; Tejeda, A ; Rault, J E ; Bertran, F ; Kądzielawa, A P ; Legut, D ; Gnida, D ; Kaczorowski, D ; Kissner, K ; Reinert, F ; Spałek, J ; Starowicz, P
  • Assuntos: Brillouin zones ; Conduction bands ; Electron density ; Fermi surfaces ; Fermions ; Heavy fermion superconductors ; Hybridization ; Matrices (mathematics) ; Photoelectric emission ; Resonance scattering ; Spectra ; Spectrum analysis
  • É parte de: Physical review. B, 2021-09, Vol.104 (12), p.1
  • Descrição: Hybridization between f electrons and conduction bands (c-f hybridization) is a driving force for many unusual phenomena. To provide insight into it, systematic studies of CeCoIn5 heavy fermion superconductor have been performed by angle-resolved photoemission spectroscopy (ARPES) in a large angular range at temperature of T = 6 K. The used photon energy of 122 eV corresponds to Ce 4d−4f resonance. Calculations carried out with the relativistic multiple scattering Korringa-Kohn-Rostoker method and one-step model of photoemission yielded realistic simulation of the ARPES spectra, indicating that Ce-In surface termination prevails. Surface states, which have been identified in the calculations, contribute significantly to the spectra. Effects of the hybridization strongly depend on wave vector. They include a dispersion of heavy electrons and bands gaining f-electron character when approaching Fermi energy. We have also observed a considerable variation of f-electron spectral weight at EF, which is normally determined by both matrix element effects and wave vector dependent c-f hybridization. Fermi surface scans covering a few Brillouin zones revealed large matrix element effects. A symmetrization of experimental Fermi surface, which reduces matrix element contribution, yielded a specific variation of 4 f-electron enhanced spectral intensity at EF around Γ and M points. Tight-binding approximation calculations for Ce-In plane provided the same universal distribution of 4f-electron density for a range of values of the parameters used in the model.
  • Editor: College Park: American Physical Society
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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