Disorder correction to the N\'eel temperature of ruthenium-doped BaFe2As2: Theoretical analysis
Abstract
We analyze theoretically nuclear magnetic resonance data for the spin-density wave phase in the ruthenium-doped BaFe2As2. Since inhomogeneous distribution of Ru~atoms introduces disorder into the system, experimentally observable random spatial variations of the spin-density wave order parameter emerge. Using perturbation theory for the Landau functional, we estimate the disorder-induced correction to the N\'eel temperature for this material. Calculated correction is significantly smaller than the N\'eel temperature itself for all experimentally relevant doping levels. This implies that the N\'eel temperature is quite insensitive to the disorder created by the dopants.
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