Scaling of the superfluid density in strongly underdoped YBa2Cu3O6+y: Evidence for a Josephson phase
C. C. Homes
DOI 10.1103/PhysRevB.80.180509 · Physical Review B
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Abstract
Recent measurements on extremely underdoped YBa2Cu3O6+y [Phys. Rev. Lett. 99, 237003 (2007)] have allowed the critical temperature Tc, superfluid density ρs0≡ρs(T⪡Tc), and dc conductivity σdc(T≳Tc) to be determined for a series of electronic dopings for Tc≃3–17 K. The general scaling relation ρs0/8≃4.4σdcTc is observed, extending the validity of both the ab-plane and c-axis scaling an order of magnitude and creating a region of overlap. This suggests that strongly underdoped materials may constitute a Josephson phase; as the electronic doping is increased a more uniform superconducting state emerges.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.333 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17.4 | Pressure not reported | unknown |
| YBa2Cu3O6.333 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
| YBa2Cu3O6.333 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.9 | Pressure not reported | unknown |
| YBa2Cu3O6.333 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.9 | Pressure not reported | unknown |
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