Effect of stoichiometry on the spin Hall angle of the half-Heusler alloy topological semimetal YPtBi

We investigated the effect of stoichiometry on the spin Hall angle of the half-Heusler alloy topological semimetal YPtBi by changing the composition ratio r of Y/Pt from 0.5 to 1.9. We confirmed that YPtBi with high C1 ordering can be deposited by co-sputtering at r = 0.5-1.5, and a large effective spin Hall angle theta(effr)(SH) = 1.0. The theta(eff)(SH)-conductivity relationship is similar to that observed in samples with exact stoichiometry, indicating that the spin Hall effect in YPtBi is robust against the change of its stoichiometry. (C) 2022 The Japan Society of Applied Physics

Automated summary

In this study, we investigated the effect of stoichiometry on the spin Hall angle of YPtBi, a half-Heusler alloy topological semimetal. By changing the composition ratio of Y/Pt, we found that YPtBi with high C1 ordering can be deposited, and it exhibits a large effective spin Hall angle even when the stoichiometry is not exact. This suggests that the spin Hall effect in YPtBi is robust against changes in its stoichiometry.