Spin excitations in KxFe2-ySe2-zSz
The recently discovered AxFe2-ySe2 high Tc superconductor has caused heated debate regarding its pairing symmetry. Theoretically, it has been proposed that its pairing state could be d wave, s+- or even s++. One way to distinguish the aforementioned pairing states is to investigate the impurity effects on the superconductivity and the spin fluctuations in these materials, since the sign reversal pairing state is very fragile against non-magnetic impurities while the s++ wave pairing states is less sensitive to the impurity scattering. Here, we propose to use inelastic neutron scattering technique to study the evolution of the resonance modes under S doping in the superconducting KxFe2-ySe2. The success of this experiment will shed some new light on our understanding of the pairing symmetry of the AxFe2-ySe2 superconductors.
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ZHAO Jun; IVANOV Alexandre; J. T. Park; SHEN Yao and Qisi Wang. (2014). Spin excitations in KxFe2-ySe2-zSz. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1374
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