Multiple Bands - A Key to High - Temperature Superconductivity in Iron Arsenides?

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 T_c 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 T_c, so that high enough T_c values can be achieved even for the case of rather small intraband and interband pairing interactions.

5 pages, 4 figures

References in corpus (4)

• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Electronic Structure of Prototype AFe_2As_2 and ReOFeAs High-Temperature Superconductors: a Comparison
• High Temperature Superconductivity in Transition Metal Oxypnictides: a Rare-Earth Puzzle?
• On superconducting and magnetic properties of iron-oxypnictides

Cited by in corpus (5)

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