Local zero-bias anomaly in tunneling spectra of a transition-metal oxide thin film

Emile D. L. Rienks, Niklas Nilius, Livia Giordano, Jacek Goniakowski, Gianfranco Pacchioni, Marcella P. Felicissimo, Thomas Risse, Hans-Peter Rust, and Hans-Joachim Freund
Phys. Rev. B 75, 205443 – Published 31 May 2007

Abstract

The electronic structure around the Fermi energy of a thin film of iron monoxide on Pt(111) is studied using low temperature scanning tunneling spectroscopy. The surface exhibits a coincidence structure (Moiré pattern) due to a lattice mismatch between the oxide thin film and the metal substrate. While the local density of states around the Fermi energy is featureless at most positions in the unit cell, a pronounced depression is observed at one particular site. The origin of this local zero-bias anomaly is discussed in relation to results from first-principle calculations. As a preliminary conclusion, it is suggested that the anomaly is a Kondo resonance due to a frustrated antiferromagnetic layer.

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  • Received 10 October 2006

DOI:https://doi.org/10.1103/PhysRevB.75.205443

©2007 American Physical Society

Authors & Affiliations

Emile D. L. Rienks1, Niklas Nilius1,*, Livia Giordano2, Jacek Goniakowski3, Gianfranco Pacchioni2, Marcella P. Felicissimo1, Thomas Risse1, Hans-Peter Rust1, and Hans-Joachim Freund1

  • 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
  • 2Dipartimento di Scienza dei Materiali, Universitá di Milano-Bicocca, via R. Cozzi, 53, I-20125 Milano, Italy
  • 3Groupe de Physique des Solides, UMR 7588 CNRS and Universités Paris 6-Paris 7 Campus de Boucicaut, 140 Rue de Lourmel, 75015 Paris, France

  • *Corresponding author. Email address: nilius@fhi-berlin.mpg.de

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Issue

Vol. 75, Iss. 20 — 15 May 2007

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