Study of the superconducting gap in RNi2B2C(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
DOI 10.1103/PhysRevB.62.1291 · Physical Review B
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Abstract
Superconductivity-induced changes in the electronic Raman-scattering response were observed for the RNi2B2C(R=Y,Lu) system in different scattering geometries. In the superconducting state, 2Δ-like peaks were observed in A1g, B1g, and B2g spectra from single crystals. The peaks in A1g and B2g symmetries are significantly sharper and stronger than the peak in B1g symmetry. The temperature dependence of the frequencies of the 2Δ-like peaks shows typical BCS-type behavior, but the apparent values of the 2Δ gap are strongly anisotropic for both systems. In addition, for both YNi2B2C and LuNi2B2C systems, there exists reproducible scattering strength below the 2Δ gap which is roughly linear to the frequency in B1g and B2g symmetries. This discovery of scattering below the gap in nonmagnetic borocarbide superconductors, which are thought to be conventional BCS-type superconductors, is a challenge for current understanding of superconductivity in this system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.3 | Pressure not reported | unknown |
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.7 | Pressure not reported | unknown |
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