Unveiling the hidden nematicity and spin subsystem in FeSeстатья
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Дата последнего поиска статьи во внешних источниках: 11 сентября 2018 г.
Аннотация:The nematic order (nematicity) is considered as one of the essential ingredients to understand the mechanism of Fe-based
superconductivity. In most Fe-based superconductors (pnictides), nematic order is reasonably close to the antiferromagnetic order.
In FeSe, in contrast, a nematic order emerges below the structure phase transition at Ts = 90 K with no magnetic order. The case of
FeSe is of paramount importance to a universal picture of Fe-based superconductors. The polarized ultrafast spectroscopy provides
a tool to probe simultaneously the electronic structure and the magnetic interactions through quasiparticle dynamics. Here we
show that this approach reveals both the electronic and magnetic nematicity below and, surprisingly, its fluctuations far above Ts to
at least 200 K. The quantitative pump–probe data clearly identify a correlation between the topology of the Fermi surface and the
magnetism in all temperature regimes, thus providing profound insight into the driving factors of nematicity in FeSe and the origin
of its uniqueness.