Projected Wave Functions and High Temperature Superconductivity
Arun Paramekanti, Mohit Randeria, Nandini Trivedi
DOI 10.1103/PhysRevLett.87.217002 · Physical Review Letters
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Abstract
We study the Hubbard model with parameters relevant to cuprates using variational Monte Carlo for projected d-wave states. For doping 0<x≲0.35 we obtain a superconductor whose order parameter Φ(x) tracks the observed nonmonotonic Tc(x). The variational parameter Δvar(x) scales with the (π,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∼x though the Fermi velocity remains finite as x→0. The Drude weight Dlow and superfluid density are consistent with experiment and Dlow∼Z.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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