The Nature of the Cooper Pair - University of Liverpool

The force from this electron is likely to be active over a
distance d near the ion. At larger distance, it tends to get
screened off by a rearrangement of the other electrons.
Assuming that the electron is roughly at the Fermi energy, its
velocity ve is related to the Fermi energy E F by:
EF = 1
2 mev 2 e .
The attraction is active for a time
τ = d
.
Superconductivity 5
ve