PHENOMENOLOGICAL THEORY OF SUPERFLUIDITY AND SUPERCONDUCTIVITY

Quantum condensation is used here as the basis for a phenomenological theory of superfluidity and superconductivity. It leads to remarkably good calculations of the transition temperatures T(c) of superfluid He -3 and He-4, as well as a large number of cuprate, heavy fermion, orga nic, dichalcogenide, and bismuth oxide superconductors. Although this approach may apply least to the long-coherence-length metallics, reaso nably good estimates are made for them and chevral superconductors. T( c) for atomic H is estimated. T(c) can be calculated as a function of number density or density of states and effective mass of normal carri ers; or alternatively with the Fermi energy as the only input paramete r. Predictions are made for a total of 26 superconductors and four sup erfluids. An estimate is also made for coherence lengths.