Superfluid 3He and the Cuprate Superconductors
This chapter is devoted to a comparison of two apparently very different physical systems, superfluid liquid 3He and the cuprate superconductors. What these two systems have in common-at least according to almost universal belief-is that they are systems of Fermi particles, already very degenerate, in which not only are the “quasi-dielectronic molecules” which we call Cooper pairs formed, but once formed are automatically forced to occupy a single two-particle state, as regards both their center-of-mass motion and their internal structure. This phenomenon is very reminiscent of the phenomenon of Bose condensation which is almost universally believed to occur in the boson system liquid 4He below the λ-point, and has in the last few years been spectacularly demonstrated in a second Bose system, trapped ultracold monatomic alkali gases. It is therefore appropriate to start this chapter with a brief discussion of the more easily understood phenomenon of simple Bose condensation and its relationship to the apparently more complex behavior associated with Cooper pairing in degenerate Fermi systems.
KeywordsCooper Pair Fermi Liquid Bose Condensation Cuprate Superconductor Spin Susceptibility
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