Correlation between Superfluid Density and TC of Underdoped YBa2Cu3O6+x Near the Superconductor-Insulator Transition
Yuri Zuev, Mun Seog Kim, Thomas R. Lemberger
DOI 10.1103/PhysRevLett.95.137002 · Physical Review Letters
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Abstract
We report measurements of the ab-plane superfluid density ns (magnetic penetration depth λ) of heavily underdoped films of YBa2Cu3O6+x, with TC’s from 6 to 50 K. We find the characteristic length for vortex unbinding transition equal to the film thickness, suggesting strongly coupled CuO2 layers. At the lowest dopings, TC is as much as 5 times larger than the upper limit set by the 2D Kosterlitz-Thouless-Berezinskii transition temperature calculated for individual CuO2 bilayers. Our main finding is that TC is not proportional to ns(0); instead, we find TC∝ns1/2.3±0.4. This conflicts with a popular point of view that quasi-2D thermal phase fluctuations determine the transition temperature.
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. | 6 | Pressure not reported | unknown |
| YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | unknown |
| YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| CaxLa1-xBa1.75-xLa0.25+xCu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
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