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| VOLUME 89 | ISSUE 3 |
PAGE 176
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| Multiple bands -- a key to high-temperature superconductivity in iron arsenides? |
E. Z. Kuchinskii, M. V. Sadovskii1)
Institute for Electrophysics, Ural Division RAS, 620016 Ekaterinburg, Russia
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PACS: 74.20.-z, 74.20.Fg, 74.20.Mn, 74.20.Rp
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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.
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