Superconductivity due to spin fluctuations originating from multiple Fermi surfaces in the double chain superconductor Pr2Ba4Cu7O15−δ
Tsuguhito Nakano, Kazuhiko Kuroki, Seiichiro Onari
DOI 10.1103/PhysRevB.76.014515 · Physical Review B
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Abstract
The mechanism of superconductivity in Pr2Ba4Cu7O15−δ is studied using a quasi-one-dimensional double chain model with appropriate hopping integrals, on-site U, and off-site repulsion V1. Applying the fluctuation exchange method to this model and solving the Eliashberg’s equation, we obtain the doping dependence of superconductivity that is consistent with the experiments. The superconducting gap has a spin singlet symmetry with the nodes of the gap running between the disconnected Fermi surfaces, which gives a temperature dependence of the spin-lattice relaxation rate that does not contradict with the experimental results.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr2Ba4Cu7O15-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
| Pr2Ba4Cu7O15-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
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