Spin-space anisotropy of magnetic excitations in FeSe(1-x)S(x)
Understanding the microscopic mechanism of superconductivity in iron-based materials is one of the most important quests in condensed matter physics research. While most theories have assumed an insignificant role of spin-orbit coupling, recent ARPES experiments showed that the energy scale of spin-orbit coupling might have been underestimated. In our recent study of FeSe(1-x)S(x) for x=0 and 0.07, we have indeed observed distinct spin-space anisotropy in the low-energy magnetic excitations, which clearly demonstrates that spin-orbit coupling casts a substantial influence on the magnetism, and that the presence of spin-space anisotropy does not require long-range magnetic order. Here, we propose to use spin-polarized inelastic neutron scattering to further pursue the study of spin-space anisotropy of magnetic excitations up to higher sulfur concentrations towards x=0.20, where a nematic quantum critical point may exist, in order to elucidate the relation between spin-orbit coupling, the nematic order, and the optimization of superconductivity.
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LI Yuan; BOURDAROT Frederic; Bourges; JEONG Jaehong; Mingwei MA; SIDIS Yvan and Guoqing Wang. (2018). Spin-space anisotropy of magnetic excitations in FeSe(1-x)S(x). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-510
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