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 (T_c), superfluid density [rho_0 (T << T_c)] and dc conductivity [sigma_dc (T ~ T_c)] to be determined for a series of electronic dopings for T_c ~ 3 - 17 K. The general scaling relation rho_0/8 ~ 4.4 sigma_dc T_c 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.

5 pages, 3 figures

References in corpus (7)

• How Cooper pairs vanish approaching the Mott insulator in Bi2Sr2CaCu2O8+d
• Direct evidence for a competition between the pseudogap and high temperature superconductivity in the cuprates
• Quantum critical behaviour in the superfluid density of strongly underdoped ultrathin cuprate films
• Coexistence of competing orders with two energy gaps in real and momentum space in high-Tc superconductor Bi2Sr2-xLaxCuO6+delta
• Scaling of the superfluid density in high-temperature superconductors
• Coherence, incoherence and scaling along the c axis of YBa_2Cu_3O_{6+x}
• An inhomogeneous Josephson phase in thin-film and High-Tc superconductors

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• The n_s - T_c correlations in granular superconductors
• Charge compensation and optimal stoichiometry in superconducting (Ca${}_x$La${}_{1-x}$)(Ba${}_{1.75-x}$La${}_{0.25+x}$)Cu${}_3$O${}_y$
• Universal scaling relations in electron-phonon superconductors