Phys. Rev. Lett. 94, 237001 (2005) [4 pages]Effective Theory of High-Temperature SuperconductorsReceived 24 August 2004; published 15 June 2005 The field theory of a fluctuating d-wave superconductor is constructed and proposed as an effective description of superconducting cuprates at low energies. The theory is used to resolve a puzzle posed by recent experiments on superfluid density in severely underdoped YBa2Cu3O6+x. In particular, the overall temperature dependence of the superfluid density at low dopings is argued to be described well by the strongly anisotropic weakly interacting Bose gas, and thus approximately linear in temperature with an almost doping-independent slope. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.237001
DOI:
10.1103/PhysRevLett.94.237001
PACS:
74.20.Mn, 71.10.Hf
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