Site-Specific Kondo Effect at Ambient Temperatures in Iron-Based Molecules

L. Gao, W. Ji, Y. B. Hu, Z. H. Cheng, Z. T. Deng, Q. Liu, N. Jiang, X. Lin, W. Guo, S. X. Du, W. A. Hofer, X. C. Xie, and H.-J. Gao
Phys. Rev. Lett. 99, 106402 – Published 5 September 2007

Abstract

Kondo resonances are a very precise measure of spin-polarized transport through magnetic impurities. However, the Kondo temperature, indicating the thermal range of stability of the magnetic properties, is very low. By contrast, we find for iron phthalocyanine a Kondo temperature in spectroscopic measurements which is well above room temperature. It is also shown that the signal of the resonance depends strongly on the adsorption site of the molecule on a gold surface. Experimental data are verified by extensive numerical simulations, which establish that the coupling between iron states and states of the substrate depends strongly on the adsorption configuration.

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  • Received 29 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.99.106402

©2007 American Physical Society

Authors & Affiliations

L. Gao1, W. Ji1, Y. B. Hu1, Z. H. Cheng1, Z. T. Deng1, Q. Liu1, N. Jiang1, X. Lin1, W. Guo1, S. X. Du1, W. A. Hofer2, X. C. Xie3,1, and H.-J. Gao1,*

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China
  • 2Surface Science Research Center, The University of Liverpool, Liverpool L69 3BX, United Kingdom
  • 3Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, USA

  • *hjgao@aphy.iphy.ac.cn

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Vol. 99, Iss. 10 — 7 September 2007

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