Impurity Effects in Sign Reversing Fully-Gapped Superconductors: Analysis of FeAs Superconductors

Abstract

To understand the impurity effect on Tc in FeAs superconductors, we analyze a simple two-band BCS model with repulsive interband interaction. The realized fully-gapped superconducting state with sign reversal, which is predicted by spin fluctuation theories in this compound, is suppressed by impurities due to the interband hopping of Cooper pairs, if the interband impurity scattering $I^{\prime }$ is equal to the intraband one $I$. When $|I^{\prime }/I|<1$, in highly contrast, Tc is almost unchanged by strong impurity scattering since the interband scattering is almost prohibited by the multiple scattering effect. Since $|I^{\prime }/I|\sim 0.5$ is expected, the robustness of superconductivity against impurities in FeAs superconductors is naturally understood in term of the sign reversing fully-gapped state.

Some discussions have been added

References in corpus (16)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Momentum dependence of the superconducting gap in NdFeAsO1-xFx single crystals measured by angle resolved photoemission spectroscopy
• Spin-singlet superconductivity with multiple gaps in PrO0.89F0.11FeAs
• Hall Effect and Resistivity in High-Tc Superconductors: The Conserving Approximation
• A possible ground state and its electronic structure of a mother material (LaOFeAs) of new superconductors
• Non-Fermi liquid behavior in the magnetotransport of CeMIn5 (M: Co and Rh): Striking similarity between quasi 2D heavy fermion and high-Tc cuprates
• Spin Ordering in LaOFeAs and Its Suppression in Superconductor LaO0.89F0.11FeAs Probed by Mössbauer Spectroscopy
• On the Superconductivity of LaFe1-yCoyAsO1-xFx
• Neutron scattering study of the oxypnictide superconductor La(O,F)FeAs
• Nernst effect of the new iron-based superconductor LaO${}_{1-x}$F${}_x$FeAs

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