Nomura T, Zhang X-X, Zherlitsyn S, Wosnitza J, Tokura Y, Nagaosa N, Seki S
Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.
Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan.
Phys Rev Lett. 2019 Apr 12;122(14):145901. doi: 10.1103/PhysRevLett.122.145901.
The magnetochiral effect (MCE) of phonons, a nonreciprocal acoustic propagation arising due to symmetry principles, is demonstrated in the chiral-lattice ferrimagnet Cu_{2}OSeO_{3}. Our high-resolution ultrasound experiments reveal that the sound velocity differs for parallel and antiparallel propagation with respect to the external magnetic field. The sign of the nonreciprocity depends on the chirality of the crystal in accordance with the selection rule of the MCE. The nonreciprocity is enhanced below the magnetic ordering temperature and at higher ultrasound frequencies, which is quantitatively explained by a proposed magnon-phonon hybridization mechanism.
声子的磁手性效应（MCE）是一种由于对称性原理产生的非互易声传播，在手性晶格铁磁体Cu₂OSeO₃中得到了证明。我们的高分辨率超声实验表明，相对于外部磁场，平行和反平行传播的声速不同。根据MCE的选择规则，非互易性的符号取决于晶体的手性。在磁有序温度以下和较高超声频率下，非互易性增强，这可以通过提出的磁振子 - 声子杂化机制进行定量解释。
