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TT: Fachverband Tiefe Temperaturen
TT 31: Frustrated Magnets I (joint session MA/TT)
TT 31.4: Vortrag
Dienstag, 10. März 2026, 10:15–10:30, POT/0361
High-field magnetic excitations in a kagome antiferromagnet — •Yoshihiko Ihara1, Dmytro Inosov2, Darren Peets2, Moyu Kato1, and Hiroyuki Yoshida1 — 1Hokkaido University, Sapporo, Japan — 2TU Dresden, Dresden, Germany
Magnetic ground states in kagome antiferromagnets have been intensively studied to reveal the quantum mechanically disordered magnetic states. By applying high magnetic fields, further intriguing phenomena have been introduced such as the plateau in magnetization curve at the 1/9 of the full saturation value in YCu3(OH)6.5Br2.5. [S. Jeon et al., Nat. Phys. 20, 435 (2024), S. Suetsugu et al., PRL 132, 226701 (2024), G. Zheng et al., PNAS 122, e2421390112 (2025)]. Although higher magnetic fields induce another magnetization plateau at the 1/3 of the full saturation, the field strength required to access the 1/3 plateau is more than 50 T and is too large to perform most of the microscopic experiments. Thus, we focus on another Cu-based mineral InCu3(OH)6Cl3, which shows the 1/3 plateau around 10 T due to smaller energy scale of exchange interactions [M. Kato et al., Commun. Phys. 7, 424 (2024)]. This allows us to perform NMR experiments in the entire field range reaching the full saturation. The measured nuclear spin-lattice relaxation rate demonstrates that the magnetic excitations are gapped in the 1/3 plateau state and the gap size increases with fields [M. Kato et al., JPSJ 94, 083704 (2025)]. We will also discuss the magnetic excitations above the 1/3 plateau based on the results obtained in the high-field magnet in Tohoku Univ.
Keywords: kagome antiferromagnet; magnetization plateau; Nuclear magnetic resonance