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Probing the Local Effects of Magnetic Impurities on Superconductivity

Ali Yazdani, B. A. Jones, C. P. Lutz, M. F. Crommie and D. M. Eigler
Science
New Series, Vol. 275, No. 5307 (Mar. 21, 1997), pp. 1767-1770
Stable URL: http://www.jstor.org/stable/2892700
Page Count: 4
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Probing the Local Effects of Magnetic Impurities on Superconductivity
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Abstract

The local effects of isolated magnetic adatoms on the electronic properties of the surface of a superconductor were studied with a low-temperature scanning tunneling microscope. Tunneling spectra obtained near magnetic adsorbates reveal the presence of excitations within the superconductor's energy gap that can be detected over a few atomic diameters around the impurity at the surface. These excitations are locally asymmetric with respect to tunneling of electrons and holes. A model calculation based on the Bogoliubov-de Gennes equations can be used to understand the details of the local tunneling spectra.

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