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.
@article{arxiv.cond-mat/9609267,
title = {Energy gap in superconducting fullerides: optical and tunneling studies},
author = {Daniel Koller and Michael C. Martin and Laszlo Mihaly and Gyorgy Mihaly and Gabor Oszlanyi and Gabriel Baumgartner and Laszlo Forro},
journal= {arXiv preprint arXiv:cond-mat/9609267},
year = {2009}
}
Comments
RevTex file with four .EPS figures. Prints to four pages. Also available at http://buckminster.physics.sunysb.edu/papers/pubrece.html