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<p>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 <i>S</i><sub>eff</sub>&#xa0; = 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 <i>S</i><sub>eff</sub>&#xa0; &gt; 1/2. Here, using synchrotron x-ray diffraction near the Dy <i>L</i><sub>3</sub> edge, we unveil a canted antiferromagnetic ground state arising from a quasi-quartet (<i>S</i><sub>eff</sub>&#xa0; = &#xa0;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 <i>S</i><sub>eff</sub>&#xa0;&gt; 1/2.</p>

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

  • 期刊论文

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  • 发表日期：

    2025年3月4日

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  • Takashi Kurumaji,
  • Masaki Gen,
  • Shunsuke Kitou,
  • Kazuhiko Ikeuchi,
  • Hajime Sagayama,
  • Hironori Nakao,
  • Tetsuya R. Yokoo,
  • Taka-hisa Arima

摘要

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.