Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6

Yiming Qiu; Wei Bao; Yang Zhao; Collin Broholm; V. Stanev; Z. Tesanovic; Y. C. Gasparovic; S. Chang; Jin Hu; Bin Qian; Minghu Fang; Zhiqiang Mao

doi:10.1103/PhysRevLett.103.067008

Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6

Superconductivity 2009-08-10 v1

Authors: Yiming Qiu , Wei Bao , Yang Zhao , Collin Broholm , V. Stanev , Z. Tesanovic , Y. C. Gasparovic , S. Chang , Jin Hu , Bin Qian , Minghu Fang , Zhiqiang Mao

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Abstract

Neutron scattering is used to probe magnetic excitations in FeSe_{0.4}Te_{0.6} (T_c=14 K). Low energy spin fluctuations are found with a characteristic wave vector $(0.5,0.5,L)$ that corresponds to Fermi surface nesting and differs from Q_m=(\delta,0,0.5) for magnetic ordering in Fe_{1+y}Te. A spin resonance with \hbar\Omega_0=6.5 meV \approx 5.3 k_BT_c and \hbar\Gamma=1.25 meV develops in the superconducting state from a normal state continuum. We show that the resonance is consistent with a bound state associated with s+/- superconductivity and imperfect quasi-2D Fermi surface nesting.

Keywords

spin resonance Fermi surface nesting iron-based superconductor neutron scattering spin gap s+/- pairing symmetry

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@article{arxiv.0905.3559,
  title  = {Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6},
  author = {Yiming Qiu and Wei Bao and Yang Zhao and Collin Broholm and V. Stanev and Z. Tesanovic and Y. C. Gasparovic and S. Chang and Jin Hu and Bin Qian and Minghu Fang and Zhiqiang Mao},
  journal= {arXiv preprint arXiv:0905.3559},
  year   = {2009}
}

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4 pages, 4 figures, Submitted to Phys. Rev. Lett

Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6

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