Static and Dynamic Magnetism in Underdoped Superconductor BaFe$_{1.92}$Co$_{0.08}$As$_2$

A. D. Christianson; M. D. Lumsden; S. E. Nagler; G. J. MacDougall; M. A. McGuire; A. S. Sefat; R. Jin; B. C. Sales; D. Mandrus

doi:10.1103/PhysRevLett.103.087002

Static and Dynamic Magnetism in Underdoped Superconductor BaFe$_{1.92}$Co$_{0.08}$As$_2$

Superconductivity 2015-05-13 v1 Strongly Correlated Electrons

Authors: A. D. Christianson , M. D. Lumsden , S. E. Nagler , G. J. MacDougall , M. A. McGuire , A. S. Sefat , R. Jin , B. C. Sales , D. Mandrus

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Abstract

We report neutron scattering measurements on single crystals of BaFe $_{1.92}$ Co $_{0.08}$ As $_2$ . The magnetic Bragg peak intensity is reduced by 6 % upon cooling through T $_C$ . The spin dynamics exhibit a gap of 8 meV with anisotropic three-dimensional (3d) interactions. Below T $_C$ additional intensity appears at an energy of $\sim$ 4.5(0.5) meV similar to previous observations of a spin resonance in other Fe-based superconductors. No further gapping of the spin excitations is observed below T $_C$ for energies down to 2 meV. These observations suggest the redistribution of spectral weight from the magnetic Bragg position to a spin resonance demonstrating the direct competition between static magnetic order and superconductivity.

Keywords

neutron scattering iron-based superconductor spin dynamics spin resonance magnetic Bragg peak superconductivity static magnetic order

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@article{arxiv.0904.0767,
  title  = {Static and Dynamic Magnetism in Underdoped Superconductor BaFe$_{1.92}$Co$_{0.08}$As$_2$},
  author = {A. D. Christianson and M. D. Lumsden and S. E. Nagler and G. J. MacDougall and M. A. McGuire and A. S. Sefat and R. Jin and B. C. Sales and D. Mandrus},
  journal= {arXiv preprint arXiv:0904.0767},
  year   = {2015}
}

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4 pages, 4 figures

Static and Dynamic Magnetism in Underdoped Superconductor BaFe$_{1.92}$Co$_{0.08}$As$_2$

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