Optical Conductivity of the Superconductors LNi2B2C ( L=Lu and Y)

F. Bommeli; L. Degiorgi; P. Wachter; B. K. Cho; P. C. Canfield; R. Chau; M. B. Maple

doi:10.1103/PhysRevLett.78.547

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Optical Conductivity of the Superconductors LNi2B2C ( L=Lu and Y)

F. Bommeli, L. Degiorgi, P. Wachter, B. K. Cho, P. C. Canfield, R. Chau, M. B. Maple

DOI 10.1103/PhysRevLett.78.547 · Physical Review Letters

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Abstract

We have measured the optical reflectivity of LuNi2B2C and YNi2B2C compounds, and have evaluated the optical conductivity both below and above the superconducting transition temperature. The normal state optical properties suggest that these superconductors are almost in the clean limit. Our results below Tc give, however, evidence of a superconducting gap signature, and are in agreement with a BCS singlet ground state. Our experimental findings also indicate a moderate-to-strong coupling limit for the pairing mechanism.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	16.6	Pressure not reported	unknown
YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.6	Pressure not reported	unknown