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Competing Magnetic Fluctuations in Iron Pnictide Superconductors: Role of Ferromagnetic Spin Correlations Revealed by NMR

TitleCompeting Magnetic Fluctuations in Iron Pnictide Superconductors: Role of Ferromagnetic Spin Correlations Revealed by NMR
Publication TypeJournal Article
Year of Publication2015
AuthorsWiecki, P, Roy, B, Johnston, DC, Bud'ko, SL, Canfield, PC, Furukawa, Y
JournalPhysical Review Letters
Volume115
Pagination137001
Date Published09
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000361677000012
Keywordsmetals, relaxation
Abstract

In the iron pnictide superconductors, theoretical calculations have consistently shown enhancements of the static magnetic susceptibility at both the stripe-type antiferromagnetic and in-plane ferromagnetic (FM) wave vectors. However, the possible existence of FM fluctuations has not yet been examined from a microscopic point of view. Here, using As-75 NMR data, we provide clear evidence for the existence of FM spin correlations in both the hole-and electron-doped BaFe2As2 families of iron-pnictide superconductors. These FM fluctuations appear to compete with superconductivity and are thus a crucial ingredient to understanding the variability of T-c and the shape of the superconducting dome in these and other iron-pnictide families.

DOI10.1103/PhysRevLett.115.137001
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Complex States