posted on 2022-04-19, 20:12authored byYafang Li, Wang Li, Jiawei Lin, Zhongnan Guo, Fan Sun, Xin Chen, Yubo Luo, Junyou Yang, Wenxia Yuan
The
ferromagnetic shandite Co3Sn2S2 has
attracted great attention in physics and chemistry communities
owing to its Kagome net, magnetism, and topological property. Here,
for the first time, we report the effect of Sb doping on the crystal
structure, magnetic interaction, and transport behavior of this ferromagnetic
Weyl semimetal. A relatively low doping limit has been determined
as x = 0.1 in a Co3Sn2–xSbxS2 system.
Single-crystal X-ray diffraction indicates that the Sb doping shows
a preferred occupation at the Sn sites between Kagome layers (Sn(1))
rather than the intralayer sites (Sn(2)), leading to the anisotropic
contraction of the lattice. The ferromagnetic interaction is weakened
upon Sb doping with the Curie temperature decreased from 172 to 146
K, which resulted from the shifting of the Fermi level toward high
energy. Due to the electron injection, the Sb-doped sample shows the
declined thermoelectric property with the reduced absolute value of
the Seebeck coefficient compared to the parent compound. The anomalous
Hall effect is still maintained in Co3Sn1.9Sb0.1S2 with the increased anomalous Hall resistivity
based on the measurement on polycrystalline samples. Our work provides
a new electron doping system to understand the interplay between the
magnetism and quantum properties of this Weyl semimetal.