Other
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ral..rept.....m&link_type=abstract
Technical Report, RAL-P-97-004
Other
Superconductors (Materials), Bose-Einstein Condensates, Bcs Theory, Helium Isotopes, Bosons, Transition Temperature, Superfluidity, Electrons, Momentum
Scientific paper
It is generally accepted that the close similarities between superfluid He-4 and superconductors (e.g. no resistance to flow and macroscopic quantum effects) are due to the fact that both systems contain a Bose-Einstein condensate (BEC), i.e. a macroscopic number of Bosons in a single momentum state. However the phase transition in the two systems appears to be driven by quite different physical mechanisms. In superconductors the electrons must be paired into Bosons before condensation can occur and in standard BCS theory, it is the strength of the pairing interaction which determines the transition temperature Tc . On the other hand in He-4, the atoms form essentially indivisible Bose particles in both the normal and superfluid states and hence the binding of the Bosons can play no part in determining Tc.
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