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Negative boron isotope effect of a '2Δ' gap peak in Raman spectra from non-magnetic borocarbide superconductors

Title
Negative boron isotope effect of a '2Δ' gap peak in Raman spectra from non-magnetic borocarbide superconductors
Authors
Yang I.-S.Klein M.V.Bud'ko S.Canfield P.C.
Ewha Authors
양인상
SCOPUS Author ID
양인상scopus
Issue Date
2002
Journal Title
Journal of Physics and Chemistry of Solids
ISSN
0022-3697JCR Link
Citation
vol. 63, no. 12, pp. 2195 - 2200
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The nickel borocarbides RNi2B2C, R = Y or Lu, have a superconducting Tc of 15-16K and exhibit properties consistent with an anisotropic s-wave gap. We briefly review their properties. Electronic Raman scattering results are presented on YNi2B2C containing 11B or 10B. In A1g and B1g Raman symmetries, there is no shift in the position of the '2Δ' peak with B-isotope. There is a distinct negative shift, however, in B2g symmetry. This is interpreted as a negative isotope shift for the gap Δ on that portion of the Fermi surface where the magnitude of the B2g Raman vertex is large. © 2002 Elsevier Science Ltd. All rights reserved.
DOI
10.1016/S0022-3697(02)00240-8
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자연과학대학 > 물리학전공 > Journal papers
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