Spin anisotropy in the stoichiometric iron-based superconductor CaKFe4As4
We propose to study the low energy spin excitations, especially the anisotropy of spin resonance, in the newly discovered stoichiometric superconductor CaKFe4As4 by polarized neutron scattering. In our previous unpolarized inelastic neutron scattering experiments, triple spin resonance modes with odd and even L-symmetries are found to appear around 9.5 meV, 13 meV and 18.3 meV. This is the first clear discovery of an even mode of spin resonance in iron-based superconductors. Since the disorder from the dopants no longer exists and the electron structure is nearly two-dimensional, the orbital order in this ultraclean compound may behave differently in each resonance mode, or be absent at all pairing channels. Such rich physics will certainly give a nice opporturnity to study the multi-band superconductivity in iron-based superconductors. The experiment will yield very first hand results of spin anisotropy about the this new 1144 compound. The coming results of this new 1144 type iron pnictides will be fully compared with the well studied 122 system, and help us to understand the magnetism, orbital physics and their relations with superconductivity in iron-based superconductors.
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XIE Tao; BOURDAROT Frederic; FENNELL Tom; Huiqian Luo; REGNAULT Louis Pierre and Tobias WEBER. (2018). Spin anisotropy in the stoichiometric iron-based superconductor CaKFe4As4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-02-532
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