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arXiv 1807.03070cond-mat.str-elcond-mat.mtrl-sci
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SmSb中反常量子振荡和非平凡Berry相的证据

Anomalous quantum oscillations and evidence for a non-trivial Berry phase in SmSb

Fan Wu, Chunyu Guo, Michael Smidman, Jinglei Zhang, Ye Chen, John Singleton, Huiqiu Yuan

摘要:

拓扑非平凡的电子结构可以引起一系列不寻常的物理现象,带拓扑与其他效应(如电子相关性和磁性)的相互作用需要进一步探索。稀土铌酸盐$X$(Sb,Bi)($X$ =镧系元素)是半金属的大家族,其中这些不同的效应可以通过稀土元素的取代来调节。在这里,我们观察到异常行为的量子振荡的一个成员,这个家庭,反铁磁SmSb。Shubnikov-de Haas(SdH)振荡的分析提供了非零Berry相位的证据,表明$α$带的非平凡拓扑。此外,显着的差异被发现之间的温度依赖性的de Haas-van Alphen效应振荡,这是很好地拟合的Lifshitz-Kosevich(LK)公式在整个测量的温度范围内,和那些从SdH测量显示出显着的分歧LK行为在低温下。我们的发现不寻常的量子振荡的反铁磁,混合价半金属与可能的非平凡的能带拓扑结构可以提供一个机会,研究拓扑结构,电子相关性和磁性之间的相互作用。

英文摘要:

Topologically non-trivial electronic structures can give rise to a range of unusual physical phenomena, and the interplay of band topology with other effects such as electronic correlations and magnetism requires further exploration. The rare earth monopnictides $X$(Sb,Bi) ($X$ = lanthanide) are a large family of semimetals where these different effects may be tuned by the substitution of rare-earth elements. Here we observe anomalous behavior in the quantum oscillations of one member of this family, antiferromagnetic SmSb. The analysis of Shubnikov-de Haas (SdH) oscillations provides evidence for a non-zero Berry phase, indicating a non-trivial topology of the $α$-band. Furthermore, striking differences are found between the temperature dependence of the amplitudes of de Haas-van Alphen effect oscillations, which are well fitted by the Lifshitz-Kosevich (LK) formula across the measured temperature range, and those from SdH measurements which show a significant disagreement with LK behavior at low temperatures. Our findings of unusual quantum oscillations in an antiferromagnetic, mixed valence semimetal with a possible non-trivial band topology can provide an opportunity for studying the interplay between topology, electronic correlations and magnetism.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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