Non-coplanar helimagnetism in the layered van-der-Waals metal DyTe3

Shun Akatsuka, Sebastian Esser (), Shun Okumura, Ryota Yambe, Rinsuke Yamada, Moritz M. Hirschmann, Seno Aji, Jonathan S. White, Shang Gao, Yoshichika Onuki, Taka-hisa Arima, Taro Nakajima and Max Hirschberger ()
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Shun Akatsuka: The University of Tokyo
Sebastian Esser: The University of Tokyo
Shun Okumura: The University of Tokyo
Ryota Yambe: The University of Tokyo
Rinsuke Yamada: The University of Tokyo
Moritz M. Hirschmann: RIKEN Center for Emergent Matter Science (CEMS)
Seno Aji: The University of Tokyo
Jonathan S. White: Paul Scherrer Institute (PSI)
Shang Gao: University of Science and Technology of China
Yoshichika Onuki: RIKEN Center for Emergent Matter Science (CEMS)
Taka-hisa Arima: RIKEN Center for Emergent Matter Science (CEMS)
Taro Nakajima: RIKEN Center for Emergent Matter Science (CEMS)
Max Hirschberger: The University of Tokyo

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Van-der-Waals magnetic materials can be exfoliated to realize ultrathin sheets or interfaces with highly controllable optical or spintronics responses. In majority, these are collinear ferro-, ferri-, or antiferromagnets, with a particular scarcity of lattice-incommensurate helimagnets of defined left- or right-handed rotation sense, or helicity. Here, we report polarized neutron scattering experiments on DyTe3, whose layered structure has highly metallic tellurium layers separated by double-slabs of dysprosium square nets. We reveal cycloidal (conical) magnetic textures, with coupled commensurate and incommensurate order parameters, and probe the evolution of this ground state in a magnetic field. The observations are well explained by a one-dimensional spin model, with an off-diagonal on-site term that is spatially modulated by DyTe3’s unconventional charge density wave (CDW) order. The CDW-driven term couples to antiferromagnetism, or to the net magnetization in an applied magnetic field, and creates a complex magnetic phase diagram indicative of competing interactions in this easily cleavable van-der-Waals helimagnet.

Date: 2024
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DOI: 10.1038/s41467-024-47127-5

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