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arXiv · 2309.16502

FeGe1-xSbx:a series of novel kagome metals with noncollinear antiferromagnetism

Jiale Huang·Chenglin Shang·Jianfei Qin·Feihao Pan·Bingxian Shi·Jinchen Wang·Juanjuan Liu·Daye Xu·Hongxia Zhang·Hongliang Wang·Lijie Hao·Peng Cheng
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Abstract

Kagome metals are important for exploring emergent phenomena due to the interplay between band topology and electron correlation.Motivated by the recent discovery of charge density wave in a kagome lattice antiferromagnetic FeGe,we investigate the impact of Sb doping on the structural,charge and magnetic order of FeGe.The charge density wave is rapidly suppressed by Sb doping(~1.5%) and the antiferromagnetic ordering temperature gradually shifts to 280K for FeGe0.7Sb0.3.For FeGe1-xSbx with x>0.1,crystal structures with slightly distorted Fe kagome lattice are formed.Their magnetic anisotropy has significant change,temperature driven spin-reorientation and field-induced spin-flop transition are identified from magnetization measurement.Interestingly,neutron diffraction reveals noncollinear antiferromagnetic structures widely exist below TN for all sample with x>0.1.This noncollinear magnetic orders could possibly be unconventional and resulted from onsite repulsion and filling condition of kagome flat band,as predicted by a recent theoretical work.

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Jiale Huang, Chenglin Shang, Jianfei Qin, Feihao Pan, Bingxian Shi, Jinchen Wang, Juanjuan Liu, Daye Xu, Hongxia Zhang, Hongliang Wang, Lijie Hao, Peng Cheng. 2023-10-03. FeGe1-xSbx:a series of novel kagome metals with noncollinear antiferromagnetism. https://doi.org/10.1103/physrevb.108.184431

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