Our laboratory aims to experimentally discover novel quantum phenomena and quantum states in a wide range of magnetic materials and to elucidate their underlying mechanisms. Recently, we observed chiral magnons—carriers of magnon spin current—in altermagnets, which have attracted attention as a third class of magnetism, by means of neutron scattering (see left figure). In the future, we will extend our scope from altermagnets to compensated magnets, aiming to observe chiral magnons and non-relativistic magnon splitting, and to establish the fundamental principles of chiral magnonics. In parallel with our studies of magnetic materials, we are developing a new neutron spectrometer, HODACA (see right figure (a)), designed for high-efficiency measurements of material dynamics. In FY2023, commissioning experiments were carried out using CsFeCl3, confirming that the Bragg peaks shown in right figure (b) and the magnetic excitations shown in right figure (c) are consistent with previous studies. A measurement efficiency 70 times higher than that of conventional spectrometers was achieved. By complementary use of the HODACA spectrometer installed at a research reactor and the HRC spectrometer operating at J-PARC, we will continue to explore new quantum phenomena.

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