Superconducting energy gap in Ba1−xKxBiO3: Temperature dependence

Transition temperature and a spatial dependence of the superconducting gap for multilayer high-temperature superconductors.

We derive the expressions for the transition temperature (Tc), and the spatial dependence of the superconducting gap for a multilayer high-Tc superconductor composed of groups of tightly spaced planes separated by a larger distance. The results are compared with experiment and provide a strong support for an interlayer hopping as the driving force of the large Tc enhancement in multilayered com...

Anisotropy of Energy Gap in Superconducting Aluminum

A pr 1 99 4 Temperature dependence of the superconducting gap anisotropy in Bi

We present the first detailed data of the momentum-resolved, temperature dependence of the superconducting gap of Bi 2 Sr 2 Ca 1 Cu 2 O 8+x , complemented by similar data on the intensity of the photoemission superconducting conden-sate spectral area. The gap anisotropy between the Γ− ¯ M and Γ−X directions increases markedly with increasing temperature, contrary to what happens for conventiona...

Energy Gap in Superconducting Fullerides: Optical and Tunneling Studies.

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 2D ­ 5.2 6 0.2 meV, corresponding to 2DykBTc ­ 4.2. The low temperature density of states and the temperature dependence of the optical conductivity resemble BCS behavior, although there is an enhanced “n...

Energy Gap Reduction in Superconducting Tin Films by Quasiparticle Injection

In Sn-I-Sn-I-Pb tunneling structures the energy gap ~Sn of Sn is reduced by quasiparticle injection via single-particle tunneling between the Sn films. ~Sn as function of the quasiparticle density is probed by the Pb contact and found in agreement with the theory of OWen and Scalapino. An instability of the energy gap of Sn is observed at the critical gap reduction ratio predicted by this theor...