Superconductivity of the One-Dimensional d-p Model with p-p transfer

Details Superconductivity of the One-Dimensional d-p Model with p-p transfer Superconductivity of the One-Dimensional d-p Model with p-p transfer

1997-08-29

arxiv.org/abs/cond-mat/9708230v1

Physics

Condensed Matter

Superconductivity

4 pages, RevTex + 5 PS figures included

Scientific paper

10.1143/JPSJ.67.389

Using the numerical diagonalization method, we investigate the one-dimensional $d$-$p$ model, simulating a Cu-O linear chain with strong Coulomb repulsions. Paying attention to the effect of the transfer energy $t_{pp}$ between the nearest neighbor oxygen-sites, we calculate the critical exponent of correlation functions $K_{\rho}$ based on the Luttinger liquid relations and the ground state energy $E_0(\phi)$ as a function of an external flux $\phi$. We find that the transfer $t_{pp}$ increases the charge susceptibility and the exponent $K_{\rho}$ in cooperation with the repulsion $U_{d}$ at Cu-site. We also show that anomalous flux quantization occurs for $K_{\rho}>1$. The superconducting region is presented on a phase diagram of $U_{d}$ vs. $t_{pp}$ plane.

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