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Phys. Rev. Lett. 80, 2893–2896 (1998)

Kondo Scattering Observed at a Single Magnetic Impurity

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Jiutao Li* and Wolf-Dieter Schneider†
Institut de Physique Expérimentale, Université de Lausanne, CH-1015 Lausanne, Switzerland

Richard Berndt
2. Physikalisches Institut, Rheinisch-Westfälische Technische Hochschule Aachen, D-52056 Aachen, Germany

Bernard Delley
Paul Scherrer Institut, CH-5232 Villigen, Switzerland

Received 6 October 1997; published in the issue dated 30 March 1998

Electron scattering of isolated Ce adatoms on Ag(111) surfaces was studied with a low-temperature scanning tunneling microscope. Tunneling spectra obtained on and near Ce reveal a characteristic dip around the Fermi energy which is absent for nonmagnetic Ag adatoms. This feature is detected over a few atomic diameters around Ce atoms at the surface. The transition matrix element from the localized f electron to the tunnel-current carrying continuum states bears a strong resemblance to discrete autoionized states. We interpret the dip spectrum as a Fano interference for the limit where the f orbital has a very small matrix element.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.2893
DOI:
10.1103/PhysRevLett.80.2893
PACS:
72.15.Qm, 61.16.Ch, 72.10.Fk

*Present address: Beckman Institute, Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana-Champaign, IL.

†Presently on a sabbatical leave at the Department of Physics and Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822.

 
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