Anisotropic Neutron Spin Resonance in Superconducting BaFe$_{1.9}$Ni$_{0.1}$As$_2$

O. J. Lipscombe; Leland W. Harriger; P. G. Freeman; M. Enderle; Chenglin Zhang; Miaoying Wang; Takeshi Egami; Jiangping Hu; Tao Xiang; M. R. Norman; Pengcheng Dai

doi:10.1103/PhysRevB.82.064515

Anisotropic Neutron Spin Resonance in Superconducting BaFe$_{1.9}$Ni$_{0.1}$As$_2$

Superconductivity 2010-08-24 v2

Authors: O. J. Lipscombe , Leland W. Harriger , P. G. Freeman , M. Enderle , Chenglin Zhang , Miaoying Wang , Takeshi Egami , Jiangping Hu , Tao Xiang , M. R. Norman , Pengcheng Dai

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Abstract

We use polarized inelastic neutron scattering to show that the neutron spin resonance below $T_c$ in superconducting BaFe $_{1.9}$ Ni $_{0.1}$ As $_2$ ( $T_c=20$ K) is purely magnetic in origin. Our analysis further reveals that the resonance peak near 7~meV only occurs for the planar response. This challenges the common perception that the spin resonance in the pnictides is an isotropic triplet excited state of the singlet Cooper pairs, as our results imply that only the $S_{001}=\pm1$ components of the triplet are involved.

Keywords

neutron spin resonance anisotropy iron-based superconductor BaFe1.9Ni0.1As2 polarized neutron scattering triplet excitation

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@article{arxiv.1003.1926,
  title  = {Anisotropic Neutron Spin Resonance in Superconducting BaFe$_{1.9}$Ni$_{0.1}$As$_2$},
  author = {O. J. Lipscombe and Leland W. Harriger and P. G. Freeman and M. Enderle and Chenglin Zhang and Miaoying Wang and Takeshi Egami and Jiangping Hu and Tao Xiang and M. R. Norman and Pengcheng Dai},
  journal= {arXiv preprint arXiv:1003.1926},
  year   = {2010}
}

Anisotropic Neutron Spin Resonance in Superconducting BaFe$_{1.9}$Ni$_{0.1}$As$_2$

Abstract

Keywords

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