Local structural distortions and their role in superconductivity in SmFeAsO${}_{1-x}$F${}_x$ superconductors

Abstract

EXAFS studies at the As K edge as a function of temperature have been carried out in SmFeAsO${}_{1-x}$F${}_x$ ($x$ = 0 and 0.2) compounds to understand the role of local structural distortions superconductivity observed in F doped compound. A significant correlation between thermal variation of local structural parameters like anion height and superconducting onset is found in the fluorinated compound. Such a variation in anion height is absent in non-superconducting compound. Increase in Fe-As bond distance just below superconducting onset temperature indicates a similarity in distortions observed in high T${}_C$ cuprates and these Fe based superconductors.

Accepted in Superconductor Science and Technology

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Cited by in corpus (3)

• Importance of structural distortions in enhancement of transition temperature in FeSe${}_{1-x}$Te${}_x$ superconductors
• Effect of spark plasma sintering on the superconducting properties of Sm-based oxypnictide
• Fluorine-substitution-dependent phase diagram and superconducting properties of Sm-based oxypnictides synthesized by a high-pressure growth technique