Physics and Astronomy, Ames Laboratory
Journal or Book Title
Physical Review Letters
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 75As 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 Tc and the shape of the superconducting dome in these and other iron-pnictide families.
American Physical Society
Wiecki, P.; Roy, B.; Johnston, David C.; Bud’ko, Sergey L.; Canfield, Paul C.; and Furukawa, Yuji, "Competing Magnetic Fluctuations in Iron Pnictide Superconductors: Role of Ferromagnetic Spin Correlations Revealed by NMR" (2015). Physics and Astronomy Publications. 592.