Polarized neutron scattering on SrCo2As2 single crystal
The systematic measurements on the doping dependence of spin excitation in Fe-based superconductors has been done and it was found that Fermi surface nesting plays a significant role in the low energy spin excitations. In SrCo2As2 where all Fe ions are replaced by Co with one electron doped, the longitudinally elongated spin excitations was observed by neutron scattering, similar to the case in hole doped BaFe2As2.Recently, our previous neutron scattering experiment suggests that there exist the ferromagnetic fluctuations in SrCo2As2 in spite of the existence of strong phonon contamination. Our DMFT calculation demonstrates that there exists a flat band nearby the fermi level, probably being responsible for the ferromagnetic instability. Further analysis shows that the spin excitations spectrum in SrCo2As2 has different orbital origin from that in BaFe2As2. However, more experimental detail of the nature of the spin fluctuations in SrCo2As2 is missing and calls for further studies. Therefore, we propose a polarized neutron scattering experiment on SrCo2As2 to distinguish the FM fluctuations from the non-magnetic background and help us understand the magnetism in this system.
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Bourges; ENDERLE Mechthild; LI Yu and Yixi Su. (2018). Polarized neutron scattering on SrCo2As2 single crystal. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-496
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