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History of the BCS to Bose-Einstein Transition

D. M. Eagles
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Abstract

Attention is drawn to the fact that some publications state or imply incorrectly that the BCS-Bose gas transition was first studied by Leggett in 1980, whereas I published a paper on this subject in 1969. Attention is also drawn to evidence from colleagues and myself in the 1980's that a ceramic sample of 3% Zr-doped SrTiO3 was on the Bose-gas side of the transition. This was, I think, the first example of a sample of any material which reached the Bose-gas regime, and also gave a world record by a factor of over one hundred for the lowest carrier concentration (~10^15cm^{-3}) at which superconductivity (or strictly the beginning of a transition) has been observed to occur.

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D. M. Eagles. 2005-01-25. History of the BCS to Bose-Einstein Transition. https://arxiv.org/abs/cond-mat/0501598

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