Kondo Resonance of a Co Atom Exchange Coupled to a Ferromagnetic Tip.
The Kondo effect of a Co atom on Cu(100) was investigated with a low-temperature scanning tunneling microscope using a monoatomically sharp nickel tip. Upon a tip-Co contact, the differential conductance spectra exhibit a spin-split asymmetric Kondo resonance. The computed ab initio value of the exchange coupling is too small to suppress the Kondo effect, but sufficiently large to produce the splitting observed. A quantitative analysis of the line shape using the numerical renormalization group technique indicates that the junction spin polarization is weak.
IPCMS, CNRS UMR 7504, Université de Strasbourg , 67034 Strasbourg, France.|CIC nanoGUNE , 20018 Donostia-San Sebastián, Spain.
D-J
DJ
Choi
Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris-Sud 11 , 91405 Orsay, France.
S
S
Guissart
IPCMS, CNRS UMR 7504, Université de Strasbourg , 67034 Strasbourg, France.
M
M
Ormaza
IPCMS, CNRS UMR 7504, Université de Strasbourg , 67034 Strasbourg, France.
N
N
Bachellier
IPCMS, CNRS UMR 7504, Université de Strasbourg , 67034 Strasbourg, France.
O
O
Bengone
Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris-Sud 11 , 91405 Orsay, France.
P
P
Simon
IPCMS, CNRS UMR 7504, Université de Strasbourg , 67034 Strasbourg, France.
L
L
Limot
Kondo effect; density functional theory; ferromagnetism; numerical renormalization group technique; scanning tunneling microscopy; single-atom contact