Three-dimensional Resonance in superconducting BaFe$_{1.9}$Ni$_{0.1}$As$_2$

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dc.creatorChi, Songxue
dc.creatorSchneidewind, Astrid
dc.creatorZhao, Jun
dc.creatorHarriger, Leland W.
dc.creatorLi, Linjun
dc.creatorLuo, Yongkang
dc.creatorCao, Guanghan
dc.creatorXu, Zhu'an
dc.creatorLoewenhaupt, Micheal
dc.creatorHu, Jiangping
dc.creatorDai, Pengcheng
dc.date2008-12-07
dc.date.accessioned2026-07-07T12:52:08Z
dc.date.available2026-07-07T12:52:08Z
dc.descriptionWe use inelastic neutron scattering to study magnetic excitations of the FeAs-based superconductor BaFe$_{1.9}$Ni$_{0.1}$As$_2$ above and below its superconducting transition temperature $T_c=20$ K. In addition to gradually open a spin gap at the in-plane antiferromagnetic ordering wavevector $(1,0,0)$, the effect of superconductivity is to form a three dimensional resonance with clear dispersion along the c-axis direction. The intensity of the resonance develops like a superconducting order parameter, and the mode occurs at distinctively different energies at $(1,0,0)$ and $(1,0,1)$. If the resonance energy is directly associated with the superconducting gap energy $Δ$, then $Δ$ is dependent on the wavevector transfers along the c-axis. These results suggest that one must be careful in interpreting the superconducting gap energies obtained by surface sensitive probes such as scanning tunneling microscopy and angle resolved photoemission.
dc.description5 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0812.1354
dc.identifierhttp://arxiv.org/abs/0812.1354
dc.identifierPhys. Rev. Lett., 102, 107006 (2009)
dc.identifierdoi:10.1103/PhysRevLett.102.107006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/223206
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleThree-dimensional Resonance in superconducting BaFe$_{1.9}$Ni$_{0.1}$As$_2$
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