January 2013

Journal

EffectsofTransitionMetalSubstitutionsontheIncommensurabilityandSpinFluctuationsinBaFe2As2byElasticandInelasticNeutronScattering

By:
Kim, M. g.; Lamsal, J.; Heitmann, T. W.; Tucker, G.; Pratt, Daniel; Khan, S. N.; Lee, Y. B.; Alam, A.; Thaler, A.; Ni, N.; Ran, S.; Budko, S; Marty, Karol J; Lumsden, Mark D; Canfield, Paul; Harmon, B.; Johnson, D. D.; Kreyssig, A.; Mcqueeney, R; Goldman, A. I.
Journal Name:
Physical Review Letters
Page Number:
167003
Volume:
109
Issue Number:
16
Publication Date:
January 2013
View DOI Listing:
https://doi.org/10.1103/PhysRevLett.109.167003

Abstract

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


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