Physics – Condensed Matter – Superconductivity
Scientific paper
2012-03-21
Phys. Rev. B 85, 134507 (2012)
Physics
Condensed Matter
Superconductivity
6 pages, 5 figures, full paper version of arXiv:1009.3882
Scientific paper
10.1103/PhysRevB.85.134507
We study the five-orbital Hubbard model including the charge quadrupole interaction for iron pnictides. Using the fluctuation-exchange (FLEX) approximation, orbital fluctuations evolve inversely proportional to the temperature, and therefore the resistivity shows linear or convex T-dependence for wide range of temperatures. We also analyze the Eliashberg gap equation, and show that s-wave superconducting state without sign reversal (s++ -wave state) emerges when the orbital fluctuations dominate over the spin fluctuations. When both fluctuations are comparable, their competition gives rise to a nodal s-wave state. The present study offers us a unified explanation for both the normal and superconducting states.
Kontani Hiroshi
Onari Seiichiro
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