Unconventional electronic Raman spectra of borocarbide superconductors

In-Sang Yang; M. V. Klein; T. P. Devereaux; I. R. Fisher; P. C. Canfield

doi:10.1016/S0921-4534(00)01106-0

paper

Unconventional electronic Raman spectra of borocarbide superconductors

arXiv:cond-mat/9912492 · doi:10.1016/S0921-4534(00)01106-0

Abstract

Borocarbide superconductors, which are thought to be conventional BCS-type superconductors, are not so conventional in several electronic Raman properties. Anisotropic gap-like features and finite scattering strength below the gap were observed for the $R$ Ni $_{2}$ B $_{2}$ C ( $R$ = Lu, Y) systems in our previous study. The effects of Co-doping on the 2 $Δ$ gap-like features and the finite scattering strength below and above the gap are studied in $R$ = Lu (B = B $^{11}$ ) system. In superconducting states, Co-doping strongly suppresses the 2 $Δ$ peak in both B $_{2 g}$ and B $_{1 g}$ symmetries. Raman cross-section calculation which includes inelastic scattering shows a relatively good fit to the features above the 2 $Δ$ peak, while it does not fully account for the features below the peak.

2 pages, 1 figure

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