# Electron wavelength in superconductors

1. Oct 11, 2012

### gildomar

What is a rough figure for the wavelength of the moving electrons in a superconductor? Or is there no easy answer for that?

2. Oct 11, 2012

### DrDu

You have to distinguish between the wavelength of the Cooper pairs and that of the electrons making up the Cooper pairs. The latter have energies near the Fermi-energy and a momentum near the Fermi-momentum $p_F=\hbar k$ and thus $\lambda=2\pi/k [/ itex] a very short wavelength. The wavelength of the Cooper pairs is liked to the current j and density n_s of the Cooper pairs as [itex] j=2e n_s k$ and is very low.