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Anomalous Nernst effect and thermal conductivity in Co3Sn2S2 polycrystals
Solid State Sciences ( IF 3.5 ) Pub Date : 2024-01-23 , DOI: 10.1016/j.solidstatesciences.2024.107454
R. Daou , S. Hébert , D. Pelloquin , A. Maignan

A polycrystalline sample of Co3Sn2S2 shandite was synthesized using spark plasma sintering for its densification. The unit cell parameters, a = 5.3688(1) Å and c = 13.1797(1) Å, refined from room temperature X-ray diffraction data, confirm the R-3m shandite structure. The frustrated nature of the Co magnetic network is invoked to explain the low effective paramagnetic moment of Co, μeff = 1.04μB/Co, whereas the ferromagnetic Curie temperature, TC = 175K, determined from T-dependent magnetic susceptibility corresponds to the metal to metal transition at that temperature. Interestingly, the residual resistivity ratio and resistivity values indicate that the electronic transport is driven by the in-plane contribution. This behaviour close to that of ab-plane transport of Co3Sn2S2 crystal fits well with the measurement of an anomalous Nernst effect (ANE). The latter reaches at T = 100K a maximum value Sxy = +1.5 μV K−1, i.e. a reduction by a factor of ≈2 as compared to crystal, explained by the reduction for the magnetization, M, of the former. This is also demonstrated by the H-dependent Sxy and M loops that match very well. Similarly, a hysteresis is found for the thermal conductivity demonstrating the existence of an anomalous thermal Hall effect of about 5 % of the total thermal conductivity. This study shows that ANE can be also measured in ceramics of Weyl ferromagnets.



中文翻译:

Co3Sn2S2 多晶中的反常能斯特效应和热导率

使用放电等离子烧结来合成Co 3 Sn 2 S 2钙铁矿的多晶样品以使其致密化。根据室温 X 射线衍射数据精炼得到的晶胞参数 a = 5.3688(1) Å 和 c = 13.1797(1) Å,证实了 R -3m闪锌矿结构 Co 磁网络的受抑性质被用来解释 Co 的低有效顺磁矩,μ eff  = 1.04μ B /Co,而铁磁居里温度 T C  = 175K,由与 T 相关的磁化率确定,对应于在该温度下金属到金属的转变。有趣的是,残余电阻率比和电阻率值表明电子传输是由面内贡献驱动的。这种行为接近Co 3 Sn 2 S 2晶体的ab面输运行为,非常适合反常能斯特效应(ANE)的测量。后者在T = 100K时达到最大值S xy  = +1.5 μV K -1,即与晶体相比减少了约2倍,这可以通过前者磁化强度M的减少来解释。非常匹配的H 相关 S xy和 M 循环也证明了这一点。类似地,发现热导率存在滞后现象,表明存在约总热导率 5% 的反常热霍尔效应。这项研究表明,ANE 也可以在外尔铁磁体陶瓷中测量。

更新日期:2024-01-23
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