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The local effect of magnetic impurities on superconductivity in CoxNbSe2 and MnxNbSe2 single crystals
Journal article   Peer reviewed

The local effect of magnetic impurities on superconductivity in CoxNbSe2 and MnxNbSe2 single crystals

M. Iavarone, G. Karapetrov, J. Fedor, D. Rosenmann, T. Nishizaki and N. Kobayashi
Journal of physics. Condensed matter, v 22(1), pp 015501-015501 (6)
13 Jan 2010
DOI: https://doi.org/10.1088/0953-8984/22/1/015501
PMID: 21386227

Abstract

Physical Sciences Physics Physics, Condensed Matter Science & Technology
We investigate the effect of individual atomic impurities on the superconducting state that they are embedded in. Using low temperature scanning tunneling microscopy and spectroscopy we could identify Co and Mn atoms in the CoxNbSe2 and MnxNbSe2 single crystals and observe the influence on the local electronic density of states (LDOS) at 0.4 K. We find that Co is in the weak scattering limit. In this case the LDOS is quite homogeneous on the sample surface, despite the number of defects, and retains sharp coherent superconducting peaks. This is in strong contrast to the effects of Mn impurities, which locally destroy superconductivity. In this case the LDOS shows a strong enhancement of spectral weight inside the superconducting gap even far from the Mn atoms. Moreover, two impurity bound states are found within the superconducting gap at E/Delta(0) = 0.18 and 0.36 at locations close to defects.

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Domestic collaboration
International collaboration
Web of Science research areas
Physics, Condensed Matter
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