Canted antiferromagnetism in a spin-orbit coupled Seff = 3/2 triangular-lattice magnet DyAuGe

Takashi Kurumaji (), Masaki Gen, Shunsuke Kitou, Kazuhiko Ikeuchi, Hajime Sagayama, Hironori Nakao, Tetsuya R. Yokoo and Taka-hisa Arima
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Takashi Kurumaji: University of Tokyo
Masaki Gen: RIKEN Center for Emergent Matter Science (CEMS)
Shunsuke Kitou: University of Tokyo
Kazuhiko Ikeuchi: High Energy Accelerator Research Organization
Hajime Sagayama: High Energy Accelerator Research Organization
Hironori Nakao: High Energy Accelerator Research Organization
Tetsuya R. Yokoo: High Energy Accelerator Research Organization
Taka-hisa Arima: University of Tokyo

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract The exploration of nontrivial magnetic states induced by strong spin-orbit interaction is a central topic of frustrated magnetism. Numerous studies have been conducted on rare-earth-based magnets and 4d/5d transition metal compounds. These are mostly described by an effective spin Seff = 1/2 for the Kramers doublet of the lowest crystal-electric-field levels. The variety of magnetic orderings can be greatly enhanced when magnetic dipolar moments intertwined with multipolar degrees of freedom, which are described by higher-rank tensors and often require the magnetic ions to have Seff > 1/2. Here, using synchrotron x-ray diffraction near the Dy L3 edge, we unveil a canted antiferromagnetic ground state arising from a quasi-quartet (Seff = 3/2) of 4f electrons in a triangular-lattice (TL) rare-earth intermetallics DyAuGe. The magnetic moment and electric-quadrupole moment are closely interlocked and a noncollinear magnetic-dipole alignment is induced by antiferroic electric-quadrupole (AFQ) ordering in the TL layers. The AFQ order is suppressed by an in-plane magnetic field, leading to the metamagnetic transition to a collinear up-up-down magnetic state. These findings offer insights into the emergence of nontrivial magnetic states in frustrated TL systems with Seff > 1/2.

Date: 2025
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DOI: 10.1038/s41467-025-57318-3

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