Abstract:

Recently, A. Hellenes et al. proposed a p-wave magnet without the need for a Pomeranchuk instability or strong electron-electron interactions (arXiv:2309.01607). We demonstrate the experimental realization of an antiferromagnetic material satisfying the symmetry requirements for p-wave spin polarization in momentum space, based on X-ray and neutron scattering experiments. In consequence of relativistic spin-orbit coupling, the p-wave state acquires a tiny net magnetization and there emerges a large anomalous Hall effect with Hall angle as large as 3~4%. Surprisingly, this is much larger than the anomalous Hall effect in known d-wave and g-wave altermagnet candidates. Neutron and x-ray scattering help to identify various magnetic orders in the plane of magnetic field and temperature, some of which have much smaller anomalous Hall effect. The results are discussed based on electronic structure models and essential symmetry arguments.

This work was supported by JSPS KAKENHI Grants No. JP22K20348, No. JP23H05431, No. JP23K13057, No. JP24H01607, and No. JP24H01604, JST CREST Grant Number JPMJCR1874, JPMJCR20T1 (Japan), and JST FOREST Grant No. JPMJFR2238 (Japan).

CV:

Dr. Max Hirschberger is an Associate Professor at the Department of Applied Physics, The University of Tokyo, Japan. Before joining U Tokyo in 2019, he was a Postdoctoral Researcher at RIKEN Center for Emergent Matter Science (Japan, 2017~19) and a Ph.D. student at Princeton University (USA, 2011~17) under the supervision of Prof. N. Phuan Ong. Max is a rising leader in condensed matter physics, focusing on the electronic and magnetic properties of quantum materials. His research group explores and synthesizes novel solids and applies advanced techniques such as resonant X-ray diffraction (RXD), neutron diffaction, and precision measurements of thermoelectric or electric properties. Max has published 47 research papers, which have garnered over 4,000 citations. His pioneering studies on Weyl semimetals, magnetic skyrmion vortices, and the thermal Hall effect have attracted wide attention. In recognition of his work, he received the Young Scientist Award of the Japanese Physical Society in 2024.

Address：

Room M253 Institute of Physics Chinese Academy of Sciences

Contect：

Xiufeng Han (82649268,xfhan@iphy.ac.cn)

Guoqiang Yu (82649215,guoqiangyu@iphy.ac.cn)

Caihua Wan (82648063, wancaihua@iphy.ac.cn)