An Alternative Route to D-wave Superconductivity: the Charge Channel

Details An Alternative Route to D-wave Superconductivity: the Charge Channel An Alternative Route to D-wave Superconductivity: the Charge Channel

1995-09-19

arxiv.org/abs/cond-mat/9509119v1

Physics

Condensed Matter

4 pages, postscript file for entire paper, also available at http://rainbow.uchicago.edu/~ldz/paper/psd09.ps

Scientific paper

We demonstrate that a $d_{x^2-y^2}$ superconducting pairing is naturally associated with the screened Coulomb interaction $V_{eff}({\bf q},\omega)$ within the $CuO_2$ plane of high $T_c$ superconductors. This pairing instability arises (via the dielectric constant) from wave-vector structure in $V_{eff}({\bf q},\omega )$ at ${\bf q}=(\pi,\pi)$, which is associated with 2D Van Hove and local field effects. Our results, which are independent of the bandstructure, suggest that direct Coulomb intereactions are significant (when compared to the spin channel) and will, at the least, enhance any other underlying mechanism for $d_{x^2-y^2}$ wave pairing.

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