The half-Heusler rare-earth intermetallic GdPtBi has recently gained attention due to peculiar magnetotransport phenomena that have been associated with the possible existence of Weyl fermions, thought to arise from the crossings of spin-split conduction and valence bands. On the other hand, similar magnetotransport phenomena observed in other rare-earth intermetallics have often been attributed to the interaction of itinerant carriers with localized magnetic moments stemming from the $4f$ shell of the rare-earth element. In order to address the origin of the magnetotransport phenomena in GdPtBi, we performed a comprehensive study of the magnetization, electrical, and thermal magnetoresistivity on two single-crystalline GdPtBi samples. In addition, we performed an analysis of the Fermi surface via Shubnikov–de Haas oscillations in one of the samples and compared the results to ab initio band structure calculations. Our findings indicate that the electrical and thermal magnetotransport in GdPtBi cannot be solely explained by Weyl physics and is strongly influenced by the interaction of both itinerant charge carriers and phonons with localized magnetic Gd ions and possibly also paramagnetic impurities.

中文翻译：

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磁性半金属GdPtBi中的各向异性电热磁传输

半Heusler稀土金属间GdPtBi最近因与Weyl费米子可能存在有关的特殊磁传输现象而引起关注，认为这是由于自旋分裂导带和价带的交叉引起的。另一方面，在其他稀土金属间化合物中观察到的相似的磁传输现象通常归因于流动剂载流子与局部磁矩的相互作用。$4F$稀土元素的壳。为了解决GdPtBi中磁传输现象的起源，我们对两个单晶GdPtBi样品的磁化，电和热磁阻进行了全面研究。此外，我们通过其中一个样本中的Shubnikov-de Haas振荡对费米表面进行了分析，并将结果与从头算带结构计算进行了比较。我们的发现表明，GdPtBi中的电和热磁输运不能仅由Weyl物理学来解释，并且受流动电荷载流子和声子与局部磁性Gd离子以及可能还有顺磁性杂质的相互作用的强烈影响。