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ARPES view on surface and bulk hybridization phenomena in the antiferromagnetic Kondo lattice CeRh2Si2

S. Patil A. Generalov M. Guettler 1 P. Kushwaha A. Chikina K. Kummer T.C. Roedel 1 A.F. Santander-Syro 1 N. Caroca-Canales C. Geibel S. Danzenbaecher Yu. Kucherenko C. Laubschat W. Allen, J. V. Vyalikh, D.
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
Abstract : The hybridization between localized 4f electrons and itinerant electrons in rare-earth-based materials gives rise to their exotic properties like valence fluctuations, Kondo behaviour, heavy-fermions, or unconventional superconductivity. Here we present an angle-resolved photoemission spectroscopy (ARPES) study of the Kondo lattice antiferromagnet CeRh2Si2, where the surface and bulk Ce-4f spectral responses were clearly resolved. The pronounced 4f (0) peak seen for the Ce terminated surface gets strongly suppressed in the bulk Ce-4f spectra taken from a Si-terminated crystal due to much larger f-d hybridization. Most interestingly, the bulk Ce-4f spectra reveal a fine structure near the Fermi edge reflecting the crystal electric field splitting of the bulk magnetic 4f (1)5/2 state. This structure presents a clear dispersion upon crossing valence states, providing direct evidence of f-d hybridization. Our findings give precise insight into f-d hybridization penomena and highlight their importance in the antiferromagnetic phases of Kondo lattices.
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Submitted on : Monday, April 11, 2016 - 4:33:01 PM
Last modification on : Wednesday, October 14, 2020 - 3:40:10 AM

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S. Patil, A. Generalov, M. Guettler, P. Kushwaha, A. Chikina, et al.. ARPES view on surface and bulk hybridization phenomena in the antiferromagnetic Kondo lattice CeRh2Si2. Nature Communications, Nature Publishing Group, 2016, 7 (11029), ⟨10.1038/ncomms11029⟩. ⟨in2p3-01301130⟩



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