Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.247002
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Funding
- MOST [2011CBA00110, 2010CB833102, 2012CB821400]
- NSFC [11004233]
- U.S. [NSF-DMR-1063866, NSF-OISE-0968226]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1063866] Funding Source: National Science Foundation
- Office Of The Director
- Office Of Internatl Science &Engineering [0968226] Funding Source: National Science Foundation
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Superconductivity in the iron pnictides develops near antiferromagnetism, and the antiferromagnetic (AF) phase appears to overlap with the superconducting phase in some materials such as BaFe2-xTxAs2 (where T = Co or Ni). Here we use neutron scattering to demonstrate that genuine long-range AF order and superconductivity do not coexist in BaFe2-xNixAs2 near optimal superconductivity. In addition, we find a first-order-like AF-to-superconductivity phase transition with no evidence for a magnetic quantum critical point. Instead, the data reveal that incommensurate short-range AF order coexists and competes with superconductivity, where the AF spin correlation length is comparable to the superconducting coherence length.
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