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Superconductivity in the iron pnictides develops near antiferromagnetism, andthe antiferromagnetic (AF) phase appears to overlap with the superconductingphase in some materials such as BaFe2-xTxAs2 (where T = Co or Ni). Here we useneutron scattering to demonstrate that genuine long-range AF order andsuperconductivity do not coexist in BaFe2-xNixAs2 near optimalsuperconductivity. In addition, we find a first-order-like AF tosuperconductivity phase transition with no evidence for a magnetic quantumcritical point. Instead, the data reveal that incommensurate short-range AForder coexists and competes with superconductivity, where the AF spincorrelation length is comparable to the superconducting coherence length.

Coexistence and competition of the short-range incommensurate antiferromagnetic order with superconductivity in BaFe2-xNixAs2