Coherent peaks and minimal probing depth in photoemission spectroscopy of Mott-Hubbard systems.
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.
Panaccione
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TASC Laboratory, INFM-CNR, in Area Science Park, S.S.14, Km 163.5, I-34012 Trieste, Italy.
Altarelli
M
M
Fondacaro
A
A
Georges
A
A
Huotari
S
S
Lacovig
P
P
Lichtenstein
A
A
Metcalf
P
P
Monaco
G
G
Offi
F
F
Paolasini
L
L
Poteryaev
A
A
Tjernberg
O
O
Sacchi
M
M