History of the BCS to Bose-Einstein Transition

Details History of the BCS to Bose-Einstein Transition History of the BCS to Bose-Einstein Transition

2005-01-25

arxiv.org/abs/cond-mat/0501598v1

Physics

Condensed Matter

Superconductivity

1 page. Edited version, with the 1989 reference omitted, will appear in Physics Today, February 2005

Scientific paper

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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