Scaling of the superfluid density in severely underdoped YBa2Cu3O6+y
Abstract
Recent measurements on extremely-underdoped YBa2Cu3O6+y [Phys. Rev. Lett. 99, 237003 (2007)] have allowed the critical temperature (Tc), superfluid density [rho0 (T << Tc)] and dc conductivity [sigmadc (T ~ Tc)] to be determined for a series of electronic dopings for Tc ~ 3 - 17 K. The general scaling relation rho0/8 ~ 4.4 sigmadc Tc 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 severely underdoped materials may constitute a Josephson phase; as the electronic doping is increased a more uniform superconducting state emerges.
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