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Application of magnetic atom induced bound states in superconducting gap for chemical identification of single magnetic atoms

Source: Appl. Phys. Lett. 96, 073113 (2010); doi:10.1063/1.3318404

Published 18 February 2010

KEYWORDS and PACS
Keywords
PACS
  • 74.25.Jb
    Electronic structure of superconductors
  • 68.43.Mn
    Adsorption kinetics
  • 68.37.Ef
    Scanning tunneling microscopy of surfaces, interfaces and thin films
  • 74.70.Ad
    Superconducting metals, alloys and binary compounds
  • 74.55.+v
    Tunneling phenomena: single particle tunneling and STM
  • YEAR: 2010
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Shuai-Hua Ji,1,2 Tong Zhang,1,2 Ying-Shuang Fu,1,2 Xi Chen,2 Jin-Feng Jia,2 Qi-Kun Xue,1,2 and Xu-Cun Ma1
1Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
2Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China
Elemental identification at single atom level has been achieved with a low temperature scanning tunneling microscope. Magnetic atoms (Mn or Cr) adsorbed on a superconducting Pb substrate induce a set of well-defined resonance states inside the superconductor gap in scanning tunneling spectroscopy. We show that these localized characteristic bound states could serve as fingerprint for chemical identification of the corresponding atoms, similar to atomic/molecular spectra widely used in optical spectrometry. The experiment demonstrates a technique for element-resolved spectroscopy with simultaneous atomic-level spatial resolution. The influence of magnetic impurity concentration on the bound states has also been investigated. ©2010 American Institute of Physics
History: Received 4 December 2009; accepted 24 January 2010; published 18 February 2010
Permalink: http://link.aip.org/link/?APPLAB/96/073113/1

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