Scaling of Berry-curvature monopole dominated large linear positive magnetoresistance
arXiv:2205.00389 · doi:10.1073/pnas.2208505119
Abstract
The linear positive magnetoresistance (LPMR) is a widely observed phenomenon in topological materials, which is promising for potential applications on topological spintronics. However, its mechanism remains ambiguous yet and the effect is thus uncontrollable. Here, we report a quantitative scaling model that correlates the LPMR with the Berry curvature, based on a ferromagnetic Weyl semimetal CoS2 that bears the largest LPMR of over 500% at 2 Kelvin and 9 Tesla, among known magnetic topological semimetals. In this system, masses of Weyl nodes existing near the Fermi level, revealed by theoretical calculations, serve as Berry-curvature monopoles and low-effective-mass carriers. Based on the Weyl picture, we propose a relation \[\text{MR}=\frac{e}{\hbar }B{{Ω}_{\text{F}}}\], with B being the applied magnetic field and \[{{Ω}_{\text{F}}}\] the average Berry curvature near the Fermi surface, and further introduce temperature factor to both MR/B slope (MR per unit field) and anomalous Hall conductivity, which establishes the connection between the model and experimental measurements. A clear picture of the linearly slowing down of carriers, i.e., the LPMR effect, is demonstrated under the cooperation of the k-space Berry curvature and real-space magnetic field. Our study not only provides an experimental evidence of Berry curvature induced LPMR for the first time, but also promotes the common understanding and functional designing of the large Berry-curvature MR in topological Dirac/Weyl systems for magnetic sensing or information storage.
References in corpus (12)
- Titanic Magnetoresistance in WTe2
- Berry phase effect in anomalous thermoelectric transport
- Intrinsic vs. extrinsic anomalous Hall effect in ferromagnets
- High performance Wannier interpolation of Berry curvature and related quantities: WannierBerri code
- Quantum Transport in Topological Semimetals under Magnetic Fields
- Magnetism and anomalous transport in the Weyl semimetal PrAlGe: Possible route to axial gauge fields
- 33% Giant Anomalous Hall Current Driven by both Intrinsic and Extrinsic Contributions in Magnetic Weyl Semimetal Co3Sn2S2
- Linear magnetochiral effect in Weyl semimetals
- Enhancement of transverse thermoelectric conductivity originating from stationary points in nodal line
- Topologically-Driven Linear Magnetoresistance in Helimagnetic FeP
- Recent advancements in the study of intrinsic magnetic topological insulators and magnetic Weyl semimetals
- Theoretical study of topological properties of ferromagnetic pyrite CoS