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25 April 2024

» pubmed » pmid11102159

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Ultrahigh-resolution photoemission spectroscopy of Ni borocarbides: direct observation of the superconducting gap and a change in gap anisotropy by impurity
T Yokoya ; T Kiss ; T Watanabe ; S Shin ; M Nohara ; H Takagi ; T Oguchi ;
Date:	4 Dec 2000
Journal:	Phys Rev Lett, 85 (23), 4952-5
Abstract:	We have performed ultrahigh-resolution photoemission spectroscopy of Y(Ni1-xPtx)2B2C ( x = 0.0 and 0.2) in order to study the changes in the density of states across the superconducting transition. Because of a drastic increase in energy resolution, we clearly observe the opening of superconducting gaps across T(c) in both compounds. Furthermore, we find a small but significant difference in the superconducting-state spectral shape. This can be explained in terms of reduction in gap anisotropy by introducing impurities and provides spectroscopic evidence for an anisotropic s-wave gap in YNi2B2C.
Source:	PubMed, pmid11102159
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