Scaling of Berry-curvature monopole dominated large linear positive magnetoresistance

Zhang S, Wang Y, Zeng Q, Shen J, Zheng X, Yang J, Wang Z, Xi C, Wang B, Zhou M, Huang R, Wei H, Yao Y, Wang S, Parkin SSP, Felser C, Liu E, Shen B (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Proceedings of the National Academy of Sciences of the United States of America National Academy of Sciences

Book Volume: 119

Article Number: e2208505119

Journal Issue: 45

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 K and 9 T, 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 MR = eh BΩ F, with B being the applied magnetic field and ΩF 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 experimental evidence of Berry curvature-induced LPMR 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.

Involved external institutions

Chinese Academy of Sciences (CAS) / 中国科学院 CN China (CN) Max-Planck-Institut für Mikrostrukturphysik (MSP) / Max Planck Institute for Microstructure Physics DE Germany (DE) University of Science and Technology Beijing (USTB) / 北京科技大学 CN China (CN) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE)

How to cite

APA:

Zhang, S., Wang, Y., Zeng, Q., Shen, J., Zheng, X., Yang, J.,... Shen, B. (2022). Scaling of Berry-curvature monopole dominated large linear positive magnetoresistance. Proceedings of the National Academy of Sciences of the United States of America, 119(45). https://dx.doi.org/10.1073/pnas.2208505119

MLA:

Zhang, Shen, et al. "Scaling of Berry-curvature monopole dominated large linear positive magnetoresistance." Proceedings of the National Academy of Sciences of the United States of America 119.45 (2022).

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