Superfluid Density in High-$T_c$ Superconductors: Enabled by Holes or Suppressed by Electrons?

Details Superfluid Density in High-$T_c$ Superconductors: Enabled by Holes or Suppressed by Electrons? Superfluid Density in High-$T_c$ Superconductors: Enabled by Holes or Suppressed by Electrons?

2007-11-08

arxiv.org/abs/0711.1192v3

Phys. Rev. B 77, 214518 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures, new paragraphs added

Scientific paper

The critical temperature of an underdoped cuprate superconductor is limited by its phase stiffness $\rho$. In this Letter we argue that the dependence of $\rho$ on doping $x$ should be understood as a consequence of deleterious competition with antiferromagnetism at large electron densities, rather than as evidence for pairing of holes in the $x =0$ Mott insulator state. Our proposal is based on the observation that the correlation energy of a d-wave superconductor increases in magnitude at finite pairing wavevector when antiferromagnetic fluctuations are strong.

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