Title:	Photoemission signature of momentum-dependent hybridization in CeCoIn5
Authors:	Kurleto, R. Fidrysiak, M. Nicolai, Laurent Christophe Minár, Jan 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.
Citation:	KURLETO, R. FIDRYSIAK, M. NICOLAI, LCH. MINÁR, J. ROSMUS, M. WALCZAK, Ł. TEJEDA, A. RAULT, J. BERTRAN, F. KĄDZIELAWA, A. LEGUT, D. GNIDA, D. KACZOROWSKI, D. KISSNER, K. REINERT, F. SPAŁEK, J. STAROWICZ, P. Photoemission signature of momentum-dependent hybridization in CeCoIn5. Physical Review B, 2021, roč. 104, č. 12, s. nestránkováno. ISSN: 2469-9950
Issue Date:	2021
Publisher:	American Physical Society
Document type:	postprint article
URI:	2-s2.0-85114643408 http://hdl.handle.net/11025/51443
ISSN:	2469-9950
Keywords in different language:	hybridization;f electrons, photoemission, resonant ARPES;Tight Binding model;multiple scattering KKR
Abstract in different language:	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 CeCoIn 5 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 4f-electron enhanced spectral intensity at EF around Gamma barre and M barre 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.
Rights:	© American Physical Society.
Appears in Collections:	Články / Articles (RAM) OBD

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