@article{b54661510a464232b7c08ba3e39fae71,
title = "Giant room temperature anomalous Hall effect and tunable topology in a ferromagnetic topological semimetal Co2MnAl",
abstract = "Weyl semimetals exhibit unusual surface states and anomalous transport phenomena. It is hard to manipulate the band structure topology of specific Weyl materials. Topological transport phenomena usually appear at very low temperatures, which sets challenges for applications. In this work, we demonstrate the band topology modification via a weak magnetic field in a ferromagnetic Weyl semimetal candidate, Co2MnAl, at room temperature. We observe a tunable, giant anomalous Hall effect (AHE) induced by the transition involving Weyl points and nodal rings. The AHE conductivity is as large as that of a 3D quantum AHE, with the Hall angle (Theta (H)) reaching a record value (tan Theta H=0.21) at the room temperature among magnetic conductors. Furthermore, we propose a material recipe to generate large AHE by gaping nodal rings without requiring Weyl points. Our work reveals an intrinsically magnetic platform to explore the interplay between magnetic dynamics and topological physics for developing spintronic devices.",
author = "Peigang Li and Jahyun Koo and Wei Ning and Jinguo Li and Leixin Miao and Lujin Min and Yanglin Zhu and Yu Wang and Nasim Alem and Chao-Xing Liu and Zhiqiang Mao and Binghai Yan",
note = "The experimental work at Tulane and Penn State is supported by the US National Science Foundation under Grant DMR1917579. L.Miao, L.Min, and N.A.{\textquoteright}s work is supported by the Penn State Center for Nanoscale Science, an NSF MRSEC under the Grant number DMR-1420620. B.Y. acknowledges the financial support by the Willner Family Leadership Institute for the Weizmann Institute of Science, the Benoziyo Endowment Fund for the Advancement of Science, Ruth and Herman Albert Scholars Program for New Scientists, and the European Research Council (ERC Grant no. 815869). C.-X.L. acknowledges the support of the Office of Naval Research (Grant No. N00014-18-1-2793), the US Department of Energy (Grant no. DESC0019064), and Kaufman New Initiative research grant KA2018-98553 of the Pittsburgh Foundation. Y.Z. and Y.W. acknowledge financial support from the National Science Foundation through the Penn State 2D Crystal Consortium-Materials Innovation Platform (2DCC-MIP) under NSF cooperative agreement DMR-1539916. Contributions - Z.M. and B.Y. conceived the project. P.L., Y.W., and Y.Z. synthesized the single crystals. J.L. made the feed rods for single crystal growth. P.L. and W.N. performed the transport and magnetization measurements. L.Min oriented crystals using Laue pattern. L.Miao and N.A. carried out TEM analyses. J.K. performed theoretical calculations. C.-X.L. discussed the gauge field and magnetic dynamics. P.L., J.K., Z.M., and B.Y. wrote the manuscript. All authors examined results. The experimental and theoretical parts of this work are supervised by Z.M. and B.Y., respectively.",
year = "2020",
month = jul,
day = "10",
doi = "https://doi.org/10.1038/s41467-020-17174-9",
language = "الإنجليزيّة",
volume = "11",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
number = "1",
}