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Article Dans Une Revue Physical Review B Année : 2021

Photoemission signature of momentum-dependent hybridization in CeCoIn 5

Antonio Tejeda
J E Rault
  • Fonction : Auteur
F Bertran

Résumé

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.
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Dates et versions

hal-03407551 , version 1 (28-10-2021)

Identifiants

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R Kurleto, M Fidrysiak, L Nicolaï, J Minár, M Rosmus, et al.. Photoemission signature of momentum-dependent hybridization in CeCoIn 5. Physical Review B, 2021, 104 (12), pp.125104. ⟨10.1103/physrevb.104.125104⟩. ⟨hal-03407551⟩
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