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Publication

Effectsoftransitionmetalsubstitutionsontheincommensurabilityandspinfluctuationsinbafe2as2byelasticandinelasticneutronscattering

Publication Type
Journal
Journal Name
Physical Review Letters
Publication Date
Page Number
167003
Volume
109
Issue
16

ThespinfluctuationspectrafromnonsuperconductingCu-substituted,andsuperconductingCo-substituted,BaFe2As2arecomparedquantitativelybyinelasticneutronscatteringmeasurementsandarefoundtobeindistinguishable.Whereasdiffractionstudiesshowtheappearanceofincommensu-ratespin-densitywaveorderinCoandNisubstitutedsamples,themagneticphasediagramforCusubstitutiondoesnotdisplayincommensurateorder,demonstratingthatsimpleelectroncountingbasedonrigid-bandconceptsisinvalid.Theseresults,supportedbytheoreticalcalculations,suggestthatsubstitu-tionalimpurityeffectsintheFeplaneplayasignificantroleincontrollingmagnetismandtheappearanceofsuperconductivity,withCudistinguishedbyenhancedimpurityscatteringandsplit-bandbehavior.