Energy gap in superconducting fullerides: optical and tunneling studies

Abstract

Tunneling and optical transmission studies have been performed on superconducting samples of Rb3C60. At temperatures much below the superconducting transition temperature Tc the energy gap is 2 Delta=5.2 +- 0.2meV, corresponding to 2 Delta/kB Tc = 4.2. The low temperature density of states, and the temperature dependence of the optical conductivity resembles the BCS behavior, although there is an enhanced ``normal state" contribution. The results indicate that this fulleride material is an s-wave superconductor, but the superconductivity cannot be described in the weak coupling limit.

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Cited by in corpus (10)

• Superconductivity in Fullerides
• An optically stimulated superconducting-like phase in K3C60 far above equilibrium Tc
• Exotic s-wave superconductivity in alkali-doped fullerides
• Strongly Anisotropic s-Wave Gaps in Exotic Superconductors
• Tuning the electronic states and superconductivity in alkali fulleride films
• Raman Scattering Study of Ba-doped C60 with t1g States
• Theoretical Phase diagram of unconventional alkali-doped fullerides
• Failure of the Migdal-Eliashberg Theory of Superconductivity in Rb_3C_60
• Search for Magnetic Field Induced Gap in a High-Tc Superconductor
• Merohedral disorder and impurity impacts on superconductivity of fullerenes