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

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

2009-05-21

arxiv.org/abs/0905.3559v1

Physical Review Letters 103, 067008 (2009)

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevLett.103.067008

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.

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