Energy gap in superconducting fullerides: optical and tunneling studies

Details Energy gap in superconducting fullerides: optical and tunneling studies Energy gap in superconducting fullerides: optical and tunneling studies

1996-09-27

arxiv.org/abs/cond-mat/9609267v1

Phys. Rev. Lett. 77, 4082 (1996).

Physics

Condensed Matter

RevTex file with four .EPS figures. Prints to four pages. Also available at http://buckminster.physics.sunysb.edu/papers/pubre

Scientific paper

10.1103/PhysRevLett.77.4082

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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