Confirmation of magnetic structure of Weyl Semimetal Eu3PbO in applied magnetic field

Materials with nontrivial topological properties (analogous in a general way to the familiar Moebius strip) are a hot topic in current solid state physics. In particular new materials showing different classes of topologically nontrivial electronic states are intensively searched for. The antiperovskite Eu3PbO may display a new type of Weyl point in the electronic structure (namely a 'magnetic Weyl point') and we have previously used polycrystalline sampled on WISH to investigate this hypothesis. However, our current data cannot distinguish between the collinear and noncollinear models we have identified. We therefore require single crystal data to discriminate between these two candidate models and confirm the magnetic phases of Eu3PbO, which is critical for understanding its intrugiong and topical topological properties as a function of field.

具有非平庸拓扑性质（nontrivial topological properties）的材料（大致类比于我们熟知的莫比乌斯带（Moebius strip））是当前固态物理学（solid state physics）领域的研究热点。尤为关键的是，学界正大力搜寻具备不同类别非平庸电子拓扑态（topologically nontrivial electronic states）的新型材料。反钙钛矿（antiperovskite）材料Eu₃PbO可能在其电子结构中呈现一种新型外尔点（Weyl point，即“磁性外尔点（magnetic Weyl point）”），此前我们利用WISH谱仪获取的多晶样品（polycrystalline samples）对该假说展开了研究。然而，当前的实验数据无法区分我们已确定的共线模型（collinear model）与非共线模型（noncollinear model）。因此，我们需要获取单晶实验数据以区分这两种候选模型，并确定Eu₃PbO的磁相（magnetic phases），这对于理解其随外场变化的引人入胜且极具前沿性的拓扑性质至关重要。