2026-01-16 日本原子力研究開発機構,東京大学,富山県立大学,東北大学
原子がジグザグに並ぶ反強磁性体で生じる「電気の流れ方の方向の偏り」（非相反伝導）の概念図
ミクロな磁石（電子のスピン）がジグザグに並び、スピンの向きに規則性が生じると、電気の流れが非対称になる
＜関連情報＞
- https://www.jaea.go.jp/02/press2025/p26011602/
- https://journals.aps.org/prl/abstract/10.1103/13pd-tlzp
ゼロ磁化反強磁性体における大きな自発的非相反電荷輸送 Large Spontaneous Nonreciprocal Charge Transport in a Zero-Magnetization Antiferromagnet
Kenta Sudo, Yuki Yanagi, Mitsuru Akaki, Hiroshi Tanida, and Motoi Kimata
Physical Review Letters Published: 5 January, 2026
DOI: https://doi.org/10.1103/13pd-tlzp
Abstract
Spontaneous breaking of time-reversal and spatial-inversion symmetries in solids triggers diverse intriguing phenomena. Although these phenomena have been extensively studied in insulators, similar investigations for metals remain limited. Herein, we report the observation and properties of spontaneous (i.e., zero-magnetic field) nonreciprocal charge transport in the zigzag intermetallic compound NdRu2Al10. This effect is attributed to the antiferromagnetic order, which can be interpreted as a magnetic toroidal dipole order. Our results reveal an excessively large nonreciprocal coefficient for this material, attributed to the strong effective magnetic field generated through − exchange interactions. The results also suggest that the nonreciprocal response of this material depends on the spin configurations of the antiferromagnetic domains. Overall, our findings are distinct from those previously reported for field-induced nonreciprocal charge transport and contribute to a comprehensive understanding of cross-correlations in symmetry-broken metals.
