title: Insight into the f-derived Fermi surface of the heavy-fermion compound YbRh2Si2.
abstract: Angle-resolved photoelectron spectroscopy (ARPES) was used to study the Fermi surface of the heavy-fermion system YbRh(2)Si(2) at a temperature of about 10 K, i.e., a factor of 2 below the Kondo energy scale. We observed sharp structures with a well-defined topology, which were analyzed by comparing with results of band-structure calculations based on the local-density approximation (LDA). The observed bulk Fermi surface presents strong similarities with that expected for a trivalent Yb state, but is slightly larger, has a strong Yb-4f character, and deviates from the LDA results by a larger region without states around the Γ point. These properties are qualitatively explained in the framework of a simple f-d hybridization model. Our analysis highlights the importance of taking into account surface states and doing an appropriate projection along k(z) when comparing ARPES data with results from theoretical calculations.
authors.affiliation: Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Danzenbächer
authors.forename: D V
authors.initials: DV
authors.lastname: Vyalikh
authors.forename: K
authors.initials: K
authors.lastname: Kummer
authors.forename: C
authors.initials: C
authors.lastname: Krellner
authors.forename: M
authors.initials: M
authors.lastname: Holder
authors.forename: M
authors.initials: M
authors.lastname: Höppner
authors.forename: Yu
authors.initials: Y
authors.lastname: Kucherenko
authors.forename: C
authors.initials: C
authors.lastname: Geibel
authors.forename: M
authors.initials: M
authors.lastname: Shi
authors.forename: L
authors.initials: L
authors.lastname: Patthey
authors.forename: S L
authors.initials: SL
authors.lastname: Molodtsov
authors.forename: C
authors.initials: C
authors.lastname: Laubschat