Abstract
31P NMR was performed on the normal state in the newly discovered iron pnictide superconductor BaFe2(As0.67P0.33)2 with maximum Tc of 30K. The Knight shift is temperature-independent while the nuclear spin–lattice relaxation rate divided by temperature (T1T)-1 exhibits a more than twofold increase on cooling. This contrasting behavior clearly indicates the development of low-lying antiferromagnetic fluctuations in BaFe2(As0.67P0.33)2 as observed in (Ba1−xKx)Fe2As2. The observed low-lying antiferromagnetic fluctuations may be universal in optimally doped “122” superconductors, in contrast to “1111” superconductors.
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