Probing the Local Effects of Magnetic Impurities on Superconductivity |
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Authors: | A Yazdani BA Jones CP Lutz MF Crommie DM Eigler |
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Institution: | IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, Ca 95120, USA. |
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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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