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

作者：Swapnil Patil, Alexander Generalov, M. Güttler, Pallavi Kushwaha, Alla Chikina, K. Kummer, T. C. Rödel, A. F. Santander-Syro, N. Caroca‐Canales, C. Geibel, S. Danzenbächer, Yu. Kucherenko, C. Laubschat, J. W. Allen, D. V. Vyalikh · 发表于：Nature Communications · 年份：2016 · DOI：10.1038/ncomms11029 · 被引用次数：78 · 研究领域：Rare-earth and actinide compounds、Iron-based superconductors research、Inorganic Chemistry and Materials

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.