Bose-Einstein to BCS Crossover Picture for High-T_c Cuprates

Details Bose-Einstein to BCS Crossover Picture for High-T_c Cuprates Bose-Einstein to BCS Crossover Picture for High-T_c Cuprates

1997-06-14

arxiv.org/abs/cond-mat/9706151v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures included inline (postscript), invited paper presented at M^2S-HTSC-V, Beijing, 1997. to be published, Physi

Scientific paper

10.1016/S0921-4534(97)00194-9

Combining (1) the universal correlations between $T_{c}$ and $n_{s}/m^{*}$ (superconducting carrier density / effective mass) and (2) the pseudo-gap behavior in the underdoped region, we obtain a picture to describe superconductivity in cuprate systems in evolution from Bose-Einstein to BCS condensation. Overdoped and Zn-substituted cuprate systems show signatures of reduced superfluid density in a microscopic phase separation. Scaling of $T_{c}$ to the superfluid volume density $n_{s}$ in all these cases indicate importance of Bose condensation.

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