Spin-excitation anisotropy in the bilayer iron-based superconductor CaKFe4As4
Tao Xie, Chang Liu, Frédéric Bourdarot, Louis-Pierre Regnault, Shiliang Li, Huiqian Luo
DOI 10.1103/PhysRevResearch.2.022018 · Physical Review Research
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Abstract
We use polarized inelastic neutron scattering to study the spin-excitation anisotropy in the bilayer iron-based superconductor CaKFe4As4 (Tc=35 K). In the superconducting state, both odd and even L modulations of spin resonance have been observed in our previous unpolarized neutron-scattering experiments [Xie et al., Phys. Rev. Lett. 120, 267003 (2018)]. Here we find that the high-energy even mode (∼18meV) is isotropic in spin space, but the low-energy odd modes consist of a c-axis polarized mode around 9 meV along with another partially overlapped in-plane mode around 12 meV. We argue that such spin anisotropy is induced by the spin-orbit coupling in the spin-vortex-type fluctuations of this unique compound. The spin anisotropy is strongly affected by the superconductivity, where it is weak below 6 meV in the normal state and then transferred to higher energy and further enhanced in the odd modes of spin resonance below Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaKFe4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
| Ca1-yLayFe1-xNixAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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