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VOLUME 89 (2009) | ISSUE 3 | PAGE 176
Multiple bands - a key to high-temperature superconductivity in iron arsenides?
PACS: 74.20.-z, 74.20.Fg, 74.20.Mn, 74.20.Rp
Abstract
In the framework of four-band model of superconductivity in iron arsenides proposed by Barzykin and Gor'kov we analyze the gap ratios on hole - like and electron - like Fermi - surface cylinders. It is shown that experimentally observed (ARPES) gap ratios can be obtained only within rather strict limits on the values of pairing coupling constants. The difference of Tc values in 1111 and 122 systems is reasonably explained by the relative values of partial densities of states. The multiple bands electronic structure of these systems leads to a significant enhancement of effective pairing coupling constant determining Tc, so that high enough Tc values can be achieved even for the case of rather small intraband and interband pairing interactions.