Fermi function for Superconductors?

[Tanja]

I don't really understand why the Fermi-Function is often used to describe superconductors. According to the BCS theory Cooper pairs should be Bosons with Spin 0. Wouldn't it make more sense to use the Bose-Einstein-Function?
Thanks
Tanja

 

[f95toli]

I think yo have to be a bit more specific.
At non-zero temperatures you always have quasiparticles in the superconductor and they are fermions, is this what you were referring to?

 

[ZapperZ]

I don't really understand why the Fermi-Function is often used to describe superconductors. According to the BCS theory Cooper pairs should be Bosons with Spin 0. Wouldn't it make more sense to use the Bose-Einstein-Function?
Thanks
Tanja

As has been mentioned, you need to be a bit more specific than this.

The Fermi function is STILL relevant here in the single-particle description. When you look at the BCS density of states, you are looking at the single-particle density of states, which is the density of states of the fermion, not the boson. The fermions that make up the composite boson (Cooper Pairs) still have to obey the FD statistics, even when the composite bosons don't.

Zz.