Finite temperature superfluid density in very underdoped cuprates

Abstract

The combination of a large superconducting gap, low transition temperature, and quasi two-dimensionality in strongly underdoped high temperature superconductors severely constrains the behavior of the ab-plane superfluid density ρwith temperature T. In particular, we argue that the contribution of nodal quasiparticles to ρ(T) is essential to account both for the amplitude of, and the recently observed deviations from, the Uemura scaling. A relation between T_c and ρ(0) which combines the effects of quasiparticle excitations at low temperatures and of vortex fluctuations near the critical temperature is proposed and discussed in light of recent experiments.

arXiv comment5 RevTex pages, 4 figures (one new); more discussion and comparison with experiment; version to appear in Phys. Rev. B

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• Restoration of the magnetic hc/e-periodicity in unconventional superconductors
• 4D-XY quantum criticality in a doped Mott insulator
• In-plane superfluid density and microwave conductivity of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br: evidence for d-wave pairing and resilient quasiparticles
• Phenomenological Ginzburg-Landau-like theory for superconductivity in the cuprates
• Giant proximity effect in a phase-fluctuating superconductor
• Vortex Dynamics and Hall Conductivity of Hard Core Bosons
• Superfluid Suppression in d-Wave Superconductors due to Disordered Magnetism
• Quantum fluctuations, pseudogap, and the T=0 superfluid density in strongly correlated d-wave superconductors
• BKT transition observed in magnetic and electric properties of YBa${}_2$Cu${}_3$O${}_{7-\delta }$ single crystals
• Screening in anisotropic superfluids and the superfluid density in underdoped cuprates