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The preformed-pairs theory of pseudogap physics in high-$T_C$ superconductorspredicts a nonanalytic $T$-dependence for the $ab$-plane superfluid fraction,$\rho_S$, at low temperatures in underdoped cuprates. We report high-precisionmeasurements of $\rho_S(T)$ on severely underdoped YBa$_2$Cu$_3$O$_{6+x}$ andY$_{0.8}$Ca$_{0.2}$Ba$_2$Cu$_3$O$_{6+x}$ films. At low $T$, $\rho_S$ looks morelike $1 - T^2$ than $1 - T^{3/2}$, in disagreement with theory.Comment: 3 pages, 2 figure

physical review. b, condensed matter and materials physics

Search for Cooper-pair fluctuations in severely underdoped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Y</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Ca</mml:mi><mml:mi>δ</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Ba</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:mn>3</mml…

Search for Cooper-pair fluctuations in severely underdopedY1−δCaδBa2Cu3