Hybridization phenomena in heavy-fermion rare-earth systems

Serguei Molodtsov

Dresden University of Technology, Institute of Solid State Physics, Dresden, Germany

High-resolution angle-resolved photoemission spectra of the heavy-fermion systems YbRh2Si2, YbIr2Si2, CePd3 as well as of a Ce monolayer on W(110) taken with different light polarizations reveal strong momentum (k) dependent splittings of the 4f emissions as well as f-character intensity variations around the expected intersection points of the 4f final states with valence bands in the Brillouin zone. The obtained phenomena for the interacting 4f states are explained in terms of a simplified periodic Anderson model by a k dependence of the electron hopping matrix element disregarding clearly interpretation in terms of single-impurity Anderson model for single-crystalline samples. The renormalization of the electronic bands in the region of the Fermi energy leads to pronounced changes of the Fermi surfaces and effective masses of electrons in accordance with heavy-fermion properties of the systems.

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