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Spin excitation anisotropy as a probe of orbital ordering in the paramagnetic tetragonal phase of superconducting BaFe1.904Ni0.09As2

Luo, Huiqian ; Wang, Meng ; Zhang, Chenglin ; Lu, Xingye ; Regnault, Louis-Pierre ; Zhang, Rui ; Li, Shiliang ; Hu, Jiangping ; Dai, Pengcheng

Physical review letters, 06 September 2013, Vol.111(10), pp.107006 [Periódico revisado por pares]

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  • Título:
    Spin excitation anisotropy as a probe of orbital ordering in the paramagnetic tetragonal phase of superconducting BaFe1.904Ni0.09As2
  • Autor: Luo, Huiqian ; Wang, Meng ; Zhang, Chenglin ; Lu, Xingye ; Regnault, Louis-Pierre ; Zhang, Rui ; Li, Shiliang ; Hu, Jiangping ; Dai, Pengcheng
  • Assuntos: Condensed Matter - Superconductivity ; Condensed Matter - Strongly Correlated Electrons
  • É parte de: Physical review letters, 06 September 2013, Vol.111(10), pp.107006
  • Descrição: We use polarized neutron scattering to demonstrate that in-plane spin excitations in electron doped superconducting BaFe1.904Ni0.096As2 (Tc=19.8  K) change from isotropic to anisotropic in the tetragonal phase well above the antiferromagnetic (AFM) ordering and tetragonal-to-orthorhombic lattice distortion temperatures (TN≈Ts=33±2  K) without an uniaxial pressure. While the anisotropic spin excitations are not sensitive to the AFM order and tetragonal-to-orthorhombic lattice distortion, superconductivity induces further anisotropy for spin excitations along the [110] and [110] directions. These results indicate that the spin excitation anisotropy is a probe of the electronic anisotropy or orbital ordering in the tetragonal phase of iron pnictides.
  • Idioma: Inglês

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