Energy Gap in Superconducting Fullerides: Optical and Tunneling Studies
Daniel Koller, Michael C. Martin, László Mihály, György Mihály, Gábor Oszlányi, Gabriel Baumgartner, László Forró
DOI 10.1103/PhysRevLett.77.4082 · Physical Review Letters
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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 2Δ=5.2±0.2meV, corresponding to 2Δ/kBTc=4.2. The low temperature density of states and the temperature dependence of the optical conductivity resemble 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure unresolved | unknown |
| Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure unresolved | unknown |
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