Search for Cooper-pair Fluctuations in Severely Underdoped YBCO Films

Details Search for Cooper-pair Fluctuations in Severely Underdoped YBCO Films Search for Cooper-pair Fluctuations in Severely Underdoped YBCO Films

2006-05-12

arxiv.org/abs/cond-mat/0605349v1

Physics

Condensed Matter

Superconductivity

3 pages, 2 figures

Scientific paper

10.1103/PhysRevB.74.012502

The preformed-pairs theory of pseudogap physics in high-$T_C$ superconductors predicts a nonanalytic $T$-dependence for the $ab$-plane superfluid fraction, $\rho_S$, at low temperatures in underdoped cuprates. We report high-precision measurements of $\rho_S(T)$ on severely underdoped YBa$_2$Cu$_3$O$_{6+x}$ and Y$_{0.8}$Ca$_{0.2}$Ba$_2$Cu$_3$O$_{6+x}$ films. At low $T$, $\rho_S$ looks more like $1 - T^2$ than $1 - T^{3/2}$, in disagreement with theory.

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