Universal scaling behavior of transport properties in non-magnetic RuO2

作者：Xinwen Peng, Zhihao Liu, Shengnan Zhang, Yi Zhou, Yuran Sun, Yahui Su, Chunxiang Wu, Tingyu Zhou, Xiaoyang Li, Yazhou Li, Hangdong Wang, Jinhu Yang, Bin Chen, Yuke Li, Chuanying Xi, Jianhua Du, Zhiwei Jiao, Quansheng Wu, Minghu Fang · 发表于：Communications Materials · 年份：2025 · DOI：10.1038/s43246-025-00905-0 · 被引用次数：12 · 研究领域：Advanced Condensed Matter Physics、Theoretical and Computational Physics、Magnetic and transport properties of perovskites and related materials

As a prototypical altermagnet, RuO2 has been subject to many controversial reports regarding its magnetic ground state and the existence of the crystal Hall effect. We obtained a high-quality RuO2 single crystal with a residual resistivity ratio (RRR = 152), and carefully measured its magnetization, longitudinal resistivity (ρxx) and Hall resistivity (ρyx) in magnetic field up to 35 T. We also calculated its electronic bands and Fermi surface, and conducted numerical simulations for its transport properties. It was found that no magnetic transition occurs below 400 K, and that all the transport properties are consistent with the numerical simulation results, indicating that the magneto-transport properties originate from the intrinsic electronic structure and are dominated by the Lorentz force. Particularly, no crystal Hall effects were observed in our RuO2 samples and both magnetoresistance and Hall resistivity follow a scaling behavior. Additionally, by comparing theoretical calculations with experimental data, we found that the magneto-transport properties calculated using the altermagnetic structure are not consistent with the experimental observations, whereas those calculated based on the non-magnetic structure show excellent agreement. These results demonstrate that RuO2 is a typical semimetal, rather than an altermagnet. The altermagnet candidate RuO2 has sparked recent debate in the scientific community regarding its magnetic ground state and the existence of a cryst...