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The interaction between localized f and itinerant conduction electrons iscrucial in the electronic properties of heavy fermion and valence fluctuatingcompounds. Using high-resolution angle-resolved photoemission spectroscopy, wesystematically investigate the electronic structure of the archetypical valencefluctuating compound EuNi2P2 that hosts multiple f electrons. At lowtemperatures, we reveal the hybridization between Eu 4f and Ni 3d states, whichcontributes to the electron mass enhancement, consistent with the periodicAnderson model. With increasing temperature, interestingly, we observe oppositetemperature evolution of electron spectral function above and below the Kondocoherence temperature near 110 K, which is in contrast to the monotonic valencechange and beyond the expectation of the periodic Anderson model. We argue thatboth f-d hybridization and correlation are imperative in the electronicproperties of EuNi2P2. Our results shed light on the understanding of novelproperties, such as heavy fermion behaviors and valence fluctuation, ofrare-earth transition-metal intermetallic compounds with multiple f electrons.

Hybridization and Correlation between f- and d-orbital electrons in a valence fluctuating compound EuNi2P2