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Coexistence of antiferromagnetic and ferromagnetic spin correlations in Ca(Fe1-xCox)(2)As-2 revealed by As-75 nuclear magnetic resonance

TitleCoexistence of antiferromagnetic and ferromagnetic spin correlations in Ca(Fe1-xCox)(2)As-2 revealed by As-75 nuclear magnetic resonance
Publication TypeJournal Article
Year of Publication2016
AuthorsCui, J, Wiecki, P, Ran, S, Bud'ko, SL, Canfield, PC, Furukawa, Y
JournalPhysical Review B
Volume94
Pagination174512
Date Published11
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000388464200004
Keywordsmetals, physics, relaxation, superconductivity
Abstract

Recent nuclear magnetic resonance (NMR) measurements revealed the coexistence of stripe-type antiferromagnetic (AFM) and ferromagnetic (FM) spin correlations in both the hole- and electron-doped BaFe2As2 families of iron-pnictide superconductors by a Korringa ratio analysis. Motivated by the NMR work, we investigate the possible existence of FM fluctuations in another iron-pnictide superconducting family, Ca(Fe1-xCox)(2)As-2. We reanalyzed our previously reported data in terms of the Korringa ratio and found clear evidence for the coexistence of stripe-type AFM and FM spin correlations in the electron-doped CaFe2As2 system. These NMR data indicate that FM fluctuations exist in general in iron-pnictide superconducting families and thus must be included to capture the phenomenology of the iron pnictides.

DOI10.1103/PhysRevB.94.174512
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Complex States

Alternate JournalPhys. Rev. B