Finite temperature superfluid density in very underdoped cuprates

Details Finite temperature superfluid density in very underdoped cuprates Finite temperature superfluid density in very underdoped cuprates

2004-01-08

arxiv.org/abs/cond-mat/0401101v2

Physical Review B, vol. 70, 094516 (2004).

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevB.70.094516

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 \rho with temperature T. In particular, we argue that the contribution of nodal quasiparticles to \rho(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 \rho(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.

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