Why does resistence go down as the temperature approaches such low temps? Is the matter approaching a Bose-Einstein condensate in some fashion?
No one knows. There’s a conjecture about it, I think it’s probably called the Cooper Conjecture. Google the term “cooper pairs”. It was clear as mud to me. :’)
http://hyperphysics.phy-astr.gsu.edu/hbase/solids/bcs.html
“The band gap suggested a phase transition in which there was a kind of condensation, like a Bose-Einstein condensation, but electrons alone cannot condense into the same energy level (Pauli exclusion principle). Yet a drastic change in conductivity demanded a drastic change in electron behavior. Perhaps coupled pairs of electrons with antiparallel spins could act like bosons?”