期刊
APL MATERIALS
卷 8, 期 1, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5132958
关键词
-
资金
- National Science Foundation [NSF/DMR-1644779, NSF/DMR-1708929]
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences [DE-FG02-07ER46352]
- National Energy Research Scientific Computing Center through DOE [DE-AC02-05CH11231]
- State of Florida
Recent reports of a large anomalous Hall effect (AHE) in ferromagnetic Weyl semimetals (FM WSMs) have led to a resurgence of interest in this enigmatic phenomenon. However, due to a lack of tunable materials, the interplay between the intrinsic mechanism caused by Berry curvature and extrinsic mechanisms due to scattering remains unclear in FM WSMs. In this contribution, we present a thorough investigation of both the extrinsic and intrinsic AHEs in a new family of FM WSMs, PrAlGe1-xSix, where x can be tuned continuously. Based on the first-principles calculations, we show that the two end members, PrAlGe and PrAlSi, have different Fermi surfaces, but similar Weyl node structures. Experimentally, we observe moderate changes in the anomalous Hall coefficient (R-S), but significant changes in the ordinary Hall coefficient (R-0) in PrAlGe1-xSix as a function of x. By comparing the magnitude of R-0 and R-S, we identify two regimes: |R-0| < |R-S| for x <= 0.5 and |R-0| > |R-S| for x > 0.5. Through a detailed scaling analysis, we uncover a universal anomalous Hall conductivity (AHC) from intrinsic contribution when x <= 0.5. Such a universal AHC is absent for x > 0.5. Our study, thus, reveals the significance of extrinsic mechanisms in FM WSMs and reports the first observation of the transition from the intrinsic to extrinsic AHE in PrAlGe1-xSix.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据