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A study of the superconducting gap in RNi$_2$B$_2$C (R = Y, Lu) single crystals by inelastic light scattering | | In-Sang Yang
; M. V. Klein
; S. L. Cooper
; P. C. Canfield
; B. K. Cho
; Sung-Ik Lee
; | | Date: |
6 Oct 1999 | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | Superconductivity-induced changes in the electronic Raman scattering response were observed for the RNi$_2$B$_2$C (R = Y, Lu) system in different scattering geometries. In the superconducting state, 2$Delta$-like peaks were observed in A$_{1g}$, B$_{1g}$, and B$_{2g}$ spectra from single crystals. The peaks in A$_{1g}$ and B$_{2g}$ symmetries are significantly sharper and stronger than the peak in B$_{1g}$ symmetry. The temperature dependence of the frequencies of the 2$Delta$-like peaks shows typical BCS-type behavior, but the apparent values of the $2Delta$ gap are strongly anisotropic for both systems. In addition, for both YNi$_2$B$_2$C and LuNi$_2$B$_2$C systems, there exists reproducible scattering strength below the $2Delta$ gap which is roughly linear to the frequency in B$_{1g}$ and B$_{2g}$ symmetries. This discovery of scattering below the gap in non-magnetic borocarbide superconductors, which are thought to be conventional BCS-type superconductors, is a challenge for current understanding of superconductivity in this system. | | Source: | arXiv, cond-mat/9910087 | | Services: | Forum | Review | PDF | Favorites | |
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