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Photoemission signature of momentum-dependent hybridization in CeCoIn 5

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), Article 125104 [Periódico revisado por pares]

American Physical Society

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  • Título:
    Photoemission signature of momentum-dependent hybridization in CeCoIn 5
  • 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: Condensed Matter ; Physics ; Strongly Correlated Electrons
  • É parte de: Physical review. B, 2021-09, Vol.104 (12), Article 125104
  • 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 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 felectron 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 4f-electron enhanced spectral intensity at EF aroundΓ andM 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: American Physical Society
  • Idioma: Inglês
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