Specifics of impurity effects in ferropnictide superconductors
Y. G. Pogorelov, M. C. Santos, V. M. Loktev
DOI 10.1103/PhysRevB.84.144510 · Physical Review B
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Abstract
Effects of impurities and disorder on quasiparticle spectrum in superconducting iron pnictides are considered. The possibility of occurrence of localized energy levels due to impurities within the superconducting gap and the related modification of band structure, including the emergence of narrow bands of extended quasiparticle states near impurity levels, is analyzed. The evolution of a superconducting state with an impurity concentration is traced and some specific effects of the modified quasiparticle spectrum on the superconducting order parameter and other observable characteristics are discussed.
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