Can’t We All Just Get Along

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Can’t We All Just Get Along Can’t We All Just Get Along? –Competing Magnetic Fluctuations in Fe-based Superconductors– Scientific Achievement Two types of magnetic fluctuations—antiferromagnetic (AFM) and ferromagnetic (FM)— have been found to compete with each other, thwarting the rise of superconductivity in iron pnictides, a class of high-temperature superconductors. Significance and Impact Findings suggest that these FM fluctuations compete with superconductivity, and this competition between FM and AFM fluctuations may be a key ingredient in understanding the temperature at which superconductivity arises in iron pnictides. AFM-type magnetic fluctuations (a) compete with FM magnetic fluctuations (b). Research Details Using 75As NMR data, clear evidence is provided for the existence of FM spin correlations in both the hole- and electron-doped BaFe2As2 families of iron-pnictide superconductors. Two types of magnetic configurations—antiferromagnetism (AFM) and ferromagnetism (FM)—have been found to compete with each other, thwarting the rise of superconductivity in iron pnictides, a class of high-temperature superconductors. In an AFM fluctuation electron spins temporary align in an alternating checkboard pattern while electron spins align temporary in the same direction in a FM fluctuation. While FM fluctuations have been suggested in the iron pnictide superconductors by theoretical calculations, the possible existence of FM fluctuations has not yet been examined from a experimental point of view. To root out FM fluctuations, scientists used nuclear magnetic resonance (NMR), a technique similar to the MRI procedure used in hospitals, which probes the structure and composition of materials. They found clear evidence for FM fluctuations in various species of iron pnictide superconductors. The findings suggest that these FM fluctuations compete with superconductivity, and this competition between FM and AFM fluctuations may be a key ingredient in understanding the temperature at which superconductivity arises in the iron pnictides. Future outlook We will continue systematic NMR investigations on Fe-based superconductors to understand the mechanism of superconductivity appearance, and also other interesting phenomena from a microscopic point of view. Paul Wiecki, Beas Roy, David C. Johnston, Sergey L. Bud’ko, Paul C. Canfield, and Yuji Furukawa, “Competing Magnetic Fluctuations in Iron Pnictide Superconductors: Role of Ferromagnetic Spin Correlations Revealed by NMR,” Physical Review Letters, 2015, 115, 137001.