论文标题
反铁磁狄拉克半含量
Colossal negative magnetoresistance in the complex charge density wave regime of an antiferromagnetic Dirac semimetal
论文作者
论文摘要
巨大的磁势（MR）是一种众所周知的现象，特别是在孔掺杂的铁磁锰矿中观察到。由于其在技术应用中的潜力，它仍然是一个主要的研究主题。尽管拓扑半学也显示出很大的MR，但其起源和性质却完全不同。在这里，我们表明，在高度电子掺杂的区域中，狄拉克半分cesbte表现出与锰矿相似的特性。 CESB $ _ {0.11} $ TE $ _ {1.90} $主机多电荷密度波（CDW）调制 - 向量，并具有复杂的磁相图。我们确认该化合物是一种抗磁性狄拉克半米。尽管具有金属的费米表面，但电子传输特性还是半导体样的，并且偏离已知的理论模型。外部磁场诱导半导体 - 金属样过渡，从而导致巨大的阴性MR。此外，在电阻率中观察到CDW和自旋调制之间耦合的签名。这种自旋调制还会产生巨大的异常大厅反应。
Colossal magnetoresistance (MR) is a well-known phenomenon, notably observed in hole-doped ferromagnetic manganites. It remains a major research topic due to its potential in technological applications. Though topological semimetals also show large MR, its origin and nature are completely different. Here, we show that in the highly electron doped region, the Dirac semimetal CeSbTe demonstrates similar properties as the manganites. CeSb$_{0.11}$Te$_{1.90}$ hosts multiple charge density wave (CDW) modulation-vectors and has a complex magnetic phase diagram. We confirm that this compound is an antiferromagnetic Dirac semimetal. Despite having a metallic Fermi surface, the electronic transport properties are semiconductor-like and deviate from known theoretical models. An external magnetic field induces a semiconductor-metal-like transition, which results in a colossal negative MR. Moreover, signatures of the coupling between the CDW and a spin modulation are observed in resistivity. This spin modulation also produces a giant anomalous Hall response.
