Chen Taishi, Tomita Takahiro, Minami Susumu, Fu Mingxuan, Koretsune Takashi, Kitatani Motoharu, Muhammad Ikhlas, Nishio-Hamane Daisuke, Ishii Rieko, Ishii Fumiyuki, Arita Ryotaro, Nakatsuji Satoru
Department of Physics, University of Tokyo, Tokyo, Japan.
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, Japan.
Nat Commun. 2021 Jan 25;12(1):572. doi: 10.1038/s41467-020-20838-1.
The recent discoveries of strikingly large zero-field Hall and Nernst effects in antiferromagnets MnX (X = Sn, Ge) have brought the study of magnetic topological states to the forefront of condensed matter research and technological innovation. These effects are considered fingerprints of Weyl nodes residing near the Fermi energy, promoting MnX (X = Sn, Ge) as a fascinating platform to explore the elusive magnetic Weyl fermions. In this review, we provide recent updates on the insights drawn from experimental and theoretical studies of MnX (X = Sn, Ge) by combining previous reports with our new, comprehensive set of transport measurements of high-quality MnSn and MnGe single crystals. In particular, we report magnetotransport signatures specific to chiral anomalies in MnGe and planar Hall effect in MnSn, which have not yet been found in earlier studies. The results summarized here indicate the essential role of magnetic Weyl fermions in producing the large transverse responses in the absence of magnetization.
最近在反铁磁体MnX（X = Sn，Ge）中发现了惊人的大零场霍尔效应和能斯特效应，这使得磁拓扑态的研究成为凝聚态物质研究和技术创新的前沿领域。这些效应被认为是位于费米能附近的外尔节点的特征，使MnX（X = Sn，Ge）成为探索难以捉摸的磁外尔费米子的迷人平台。在这篇综述中，我们结合之前的报告以及我们对高质量MnSn和MnGe单晶进行的全新综合输运测量结果，提供了从MnX（X = Sn，Ge）的实验和理论研究中获得的最新见解。特别是，我们报告了MnGe中特定于手征反常的磁输运特征以及MnSn中的平面霍尔效应，这些在早期研究中尚未被发现。这里总结的结果表明，磁外尔费米子在没有磁化的情况下产生大横向响应中起着至关重要的作用。
