Projected Wavefunctions and High Temperature Superconductivity

Details Projected Wavefunctions and High Temperature Superconductivity Projected Wavefunctions and High Temperature Superconductivity

2001-01-09

arxiv.org/abs/cond-mat/0101121v2

Physics

Condensed Matter

Superconductivity

4 pages, 5 EPS figures. (1) Many improvements including discussion of n(k) and superfluid density. (2) Added comparison with s

Scientific paper

10.1103/PhysRevLett.87.217002

We study the Hubbard model with parameters relevant to the cuprates, using variational Monte Carlo with projected d-wave states. For doping 0 < x < 0.35 we obtain a superconductor whose order parameter tracks the observed nonmonotonic Tc(x). The variational parameter Delta_{var}(x) scales with the (pi,0) ``hump'' and T* seen in photoemission. Projection leads to incoherence in the spectral function, and from the singular behavior of its moments we obtain the nodal quasiparticle weight Z which vanishes linearly in x, though the Fermi velocity remains finite as x approaches zero. The Drude weight D_{low} and superfluid density are consistent with experiments, and D_{low} scales with Z.

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