Search for Cooper-pair fluctuations in severely underdoped Y_1−δCa_δBa_2Cu_3O_6+x films(δ=0 and 0.2)
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Publisher:American Physical Society
Citation:Yuri L. Zuev, Iulian Hetel, Thomas R. Lemberger, "Search for Cooper-pair fluctuations in severely underdoped Y_1−δCa_δBa_2Cu_3O_6+x films(δ=0 and 0.2)," Physical Review B 74, no. 1 (2006), doi: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, ρ_S, at low temperatures in underdoped cuprates. We report high-precision measurements of ρ_S(T) on severely underdoped YBa_2Cu_3O_6+x and Y_0.8Ca_0.2Ba_2Cu_3O_6+x films. At low T, ρ_S looks more like 1−T^2 than 1−T^3∕2, in disagreement with theory.
Rights:©2006 The American Physical Society
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