Correlated electrons step by step: itinerant-to-localized transition of fe impurities in free-electron metal hosts.
High-resolution photoemission spectroscopy and ab initio calculations have been employed to analyze the onset and progression of d-sp hybridization in Fe impurities deposited on alkali metal films. The interplay between delocalization, mediated by the free-electron environment, and Coulomb interaction among d electrons gives rise to complex electronic configurations. The multiplet structure of a single Fe atom evolves and gradually dissolves into a quasiparticle peak near the Fermi level with increasing host electron density. The effective multiorbital impurity problem within the exact diagonalization scheme describes the whole range of hybridizations.
Carbone
C
C
Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, I-34012 Trieste, Italy.
Veronese
M
M
Moras
P
P
Gardonio
S
S
Grazioli
C
C
Zhou
P H
PH
Rader
O
O
Varykhalov
A
A
Krull
C
C
Balashov
T
T
Mugarza
A
A
Gambardella
P
P
Lebègue
S
S
Eriksson
O
O
Katsnelson
M I
MI
Lichtenstein
A I
AI