Photoemission signature of momentum-dependent hybridization in CeCoIn5

R. Kurleto, M. Fidrysiak, L. Nicolaï, J. Minár, M. Rosmus, Ł. Walczak, A. Tejeda, J. E. Rault, F. Bertran, A. P. Kądzielawa, D. Legut, D. Gnida, D. Kaczorowski, K. Kissner, F. Reinert, J. Spałek, and P. Starowicz
Phys. Rev. B 104, 125104 – Published 2 September 2021

Abstract

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 4d4f 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 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.

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  • Received 17 December 2020
  • Revised 21 July 2021
  • Accepted 23 August 2021

DOI:https://doi.org/10.1103/PhysRevB.104.125104

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

R. Kurleto1, M. Fidrysiak2, L. Nicolaï3, J. Minár3, M. Rosmus1,4, Ł. Walczak5, A. Tejeda6, J. E. Rault7, F. Bertran7, A. P. Kądzielawa8,2, D. Legut8, D. Gnida9, D. Kaczorowski9, K. Kissner10, F. Reinert10, J. Spałek2, and P. Starowicz1,*

  • 1Marian Smoluchowski Institute of Physics, Jagiellonian University, Łojasiewicza 11, 30-348 Kraków, Poland
  • 2Institute of Theoretical Physics, Jagiellonian University, Łojasiewicza 11, 30-348 Kraków, Poland
  • 3New Technologies-Research Center, University of West Bohemia, Univerzitní 8, 306 14 Pilsen, Czech Republic
  • 4Solaris National Synchrotron Radiation Centre, Jagiellonian University, Czerwone Maki 98, 30-392 Kraków, Poland
  • 5PREVAC sp. z o.o., Raciborska 61, PL-44362 Rogów, Poland
  • 6Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay, 91405 Orsay, France
  • 7Synchrotron-SOLEIL, Saint-Aubin, BP48, F91192 Gif sur Yvette Cedex, France
  • 8IT4Innovations, VŠB - Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic
  • 9Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland
  • 10Experimentelle Physik VII and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

  • *pawel.starowicz@uj.edu.pl

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Vol. 104, Iss. 12 — 15 September 2021

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