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Coexistence and Competition of the Short-Range Incommensurate Antiferromagnetic Order with the Superconducting State of BaFe 2 − x Ni x As 2

Luo, Huiqian ; Zhang, Rui ; Laver, Mark ; Yamani, Zahra ; Wang, Meng ; Lu, Xingye ; Wang, Miaoyin ; Chen, Yanchao ; Li, Shiliang ; Chang, Sung ; Lynn, Jeffrey W. ; Dai, Pengcheng

Physical Review Letters, 6/2012, Vol.108(24) [Periódico revisado por pares]

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  • Título:
    Coexistence and Competition of the Short-Range Incommensurate Antiferromagnetic Order with the Superconducting State of BaFe 2 − x Ni x As 2
  • Autor: Luo, Huiqian ; Zhang, Rui ; Laver, Mark ; Yamani, Zahra ; Wang, Meng ; Lu, Xingye ; Wang, Miaoyin ; Chen, Yanchao ; Li, Shiliang ; Chang, Sung ; Lynn, Jeffrey W. ; Dai, Pengcheng
  • Assuntos: Condensed Matter - Superconductivity ; Condensed Matter - Strongly Correlated Electrons
  • É parte de: Physical Review Letters, 6/2012, Vol.108(24)
  • Descrição: 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. Comment: 7 pages, 5 figures, 1 table
  • Idioma: Inglês

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