狄拉克半金属PdTe中线性磁电阻和平面霍尔效应的观测
Observation of linear magnetoresistance and planar Hall effect in the Dirac semimetal PdTe
- Institute of Nano Science and Technology（印度纳米科学与技术研究所）
- Indian Institute of Science Education and Research Mohali（印度科学教育研究学院莫哈利分校）
- Indian Institute of Technology Ropar（印度技术学院罗帕尔分校）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究首次在狄拉克半金属PdTe中观测到线性磁电阻和平面霍尔效应，并通过分析证明其源于无序驱动的迁移率涨落和各向异性轨道磁电阻，而非拓扑机制，强调了区分拓扑与经典输运的重要性。
AI中文摘要：
PdTe是一种同时表现出超导电性的狄拉克半金属，为探索拓扑超导和非常规磁输运现象提供了一个有趣的平台。尽管近年来对PdTe的超导性质已进行了广泛研究，但其详细的磁输运现象仍未得到探索。在此，我们首次在高质量PdTe单晶中观测到线性磁电阻（LMR）和平面霍尔效应（PHE）。我们在面内（$B \parallel I$）和面外（$B \perp I$）两种构型下均观测到与温度相关的非饱和LMR。磁电阻（MR）在临界场Bc处表现出从抛物线依赖到线性依赖的交叉，详细分析表明，无序驱动的迁移率涨落是其起源，而非Abrikosov量子极限机制。此外，通过在样品平面内旋转磁场，我们观测到了显著的PHE。对PHE振幅的场和温度依赖性以及参数图的详细分析表明，PHE主要源于各向异性的轨道磁电阻，而非手性反常。我们的结果表明，尽管狄拉克点接近费米能级，但在狄拉克半金属PdTe中观测到的LMR和PHE可以在半经典输运框架内理解，这凸显了在拓扑材料中区分拓扑输运机制和常规经典输运机制的重要性。
英文摘要：
PdTe is a Dirac semimetal that also exhibits superconductivity, providing an intriguing platform to explore topological superconductivity and unconventional magnetotransport phenomena. While the superconducting properties of PdTe have been extensively studied in recent years, the detailed magnetotransport phenomena have remained unexplored. Here, we present the first observation of linear magnetoresistance (LMR) and the planar Hall effect (PHE) in a high-quality single crystal of PdTe. We observe temperature-dependent unsaturated LMR in both in-plane ($B \parallel I$) and out-of-plane ($B \perp I$) configurations. The magnetoresistance (MR) shows a crossover from parabolic to linear dependence at the critical field Bc, and detailed analysis indicates that disorder-driven mobility fluctuations are the origin rather than the Abrikosov quantum-limit mechanism. Furthermore, prominent PHE has been observed by rotating the magnetic field within the plane of the sample. The detailed analysis of the field and temperature dependence of PHE-amplitude, along with the parametric plot, suggests that PHE originates predominantly from the anisotropic orbital magnetoresistance rather than the chiral anomaly. Our results demonstrate that although the Dirac point is close to the Fermi level, the observed LMR and PHE in the Dirac semimetal PdTe can be understood within a semiclassical transport framework, highlighting the importance of distinguishing between topological and conventional classical transport mechanisms in topological materials
