title: Coherent peaks and minimal probing depth in photoemission spectroscopy of Mott-Hubbard systems.
abstract: We have measured hard x-ray photoemission spectra of pure vanadium sesquioxide (V(2)O(3)) across its metal-insulator transition. We show that, in the metallic phase, a clear correlation exists between the shakedown satellites observed in the vanadium 2p and 3p core-level spectra and the coherent peak measured at the Fermi level. Comparing experimental results and dynamical mean-field theory calculations, we estimate the Hubbard energy U in V(2)O(3) (4.20+/-0.05 eV). From our bulk-sensitive photoemission spectra we infer the existence of a critical probing depth for investigating electronic properties in strongly correlated solids.
authors.affiliation: TASC Laboratory, INFM-CNR, in Area Science Park, S.S.14, Km 163.5, I-34012 Trieste, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Panaccione
authors.forename: M
authors.initials: M
authors.lastname: Altarelli
authors.forename: A
authors.initials: A
authors.lastname: Fondacaro
authors.forename: A
authors.initials: A
authors.lastname: Georges
authors.forename: S
authors.initials: S
authors.lastname: Huotari
authors.forename: P
authors.initials: P
authors.lastname: Lacovig
authors.forename: A
authors.initials: A
authors.lastname: Lichtenstein
authors.forename: P
authors.initials: P
authors.lastname: Metcalf
authors.forename: G
authors.initials: G
authors.lastname: Monaco
authors.forename: F
authors.initials: F
authors.lastname: Offi
authors.forename: L
authors.initials: L
authors.lastname: Paolasini
authors.forename: A
authors.initials: A
authors.lastname: Poteryaev
authors.forename: O
authors.initials: O
authors.lastname: Tjernberg
authors.forename: M
authors.initials: M
authors.lastname: Sacchi