Search for Cooper-pair fluctuations in severely underdoped Y1−δCaδBa2Cu3O6+x films (δ=0 and 0.2)
Yuri L. Zuev, Iulian Hetel, Thomas R. Lemberger
DOI 10.1103/PhysRevB.74.012502 · Physical Review B
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Abstract
The preformed-pairs theory of pseudogap physics in high-TC superconductors predicts a nonanalytic T dependence for the ab-plane superfluid fraction, ρS, at low temperatures in underdoped cuprates. We report high-precision measurements of ρS(T) on severely underdoped YBa2Cu3O6+x and Y0.8Ca0.2Ba2Cu3O6+x films. At low T, ρS looks more like 1−T2 than 1−T3∕2, in disagreement with theory.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure not reported | unknown |
| YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
| YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | unknown |
| Y0.8Ca0.2Ba2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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