Explore spin gaps by polarized neutron scattering on the heavily overdoped BaFe2-xNixAs2
Over the past 5 years,we have mapped out the spin spectrum of electron doped BaFe2-xNixAs2 throughout the phase diagram except the zone boundary of overdoped superconducting region. Whereas the high-energy spin excitations do not change with dopings, the low-energy spin excitations are quickly suppressed upon doping and finnally resulting in a large spin gap up to 50 meV in the heavily overdoped non-superconducting samples. It is still not clear whether the spin gap coincides with the disappearance of superconductivity in overdoped regime, where the Fermi surface nesting is invalid due to no hole pockets. We have tried to measure the spin gap for x=0.20, 0.22 and 0.27 in our last experiment at IN8, only weak magnetic signals with too many spurious from incoherent scattering and phonon excitations of sample and aluminum holder are obtained, which is hard to lead to any conclusions. Thus we propose to measure the magnetic excitations in these heavily overdoped BaFe2-xNixAs2 by using polarized neutron beam in spin-flip channel, which is a very efficient way to eliminate the mixed spurious signal from nuclear scattering and phonons
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Huiqian Luo; D.T. Adroja; IVANOV Alexandre and Jiri Kulda. (2016). Explore spin gaps by polarized neutron scattering on the heavily overdoped BaFe2-xNixAs2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-450
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