Physics – Condensed Matter – Superconductivity
Scientific paper
2007-01-09
Physics
Condensed Matter
Superconductivity
5 pages, 8 figures, REVTeX
Scientific paper
10.1103/PhysRevB.76.014515
The mechanism of superconductivity in Pr$_2$Ba$_4$Cu$_7$O$_{15-\delta}$ is studied using a quasi-one dimensional double chain model with appopriate hopping integrals, on-site $U$, and off-site repulsion $V_1$. Applying the fluctuation exchange method to this model and solving the Eliashberg equation, we obtain the doping dependence of superconductivity that is consistent with the experiments. The superconducting gap has an extended s-wave-like form, which gives a temperature dependence of the spin lattice relaxation rate that does not contradict with the experimental results.
Kuroki Kazuhiko
Nakano Tsuguhito
Onari Seiichiro
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