Magnetic Phase Diagram of van der Waals Antiferromagnet TbTe3

Волкова, О. С.; Hadj-Azzem, A.; Reményi, G.; Lorenzo, J. E.; Monçeau, P.; Синченко, А. А.; Vasiliev, A. N.

doi:10.3390/ma15248772

Cited by 3 publications

(1 citation statement)

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“…This quasi two-dimensional electronic structure amplifies correlation phenomena, such as the formation of charge-density wave (CDW) order [22] and superconductivity [23,24], while also hosting protected band degeneracies [16,25]. In view of intense research efforts on RTe 3 , it is remarkable that their magnetism has never been discussed in detail; in particular, no full refinement of magnetic structures is available [26][27][28][29][30][31].…”

Section: Main Textmentioning

confidence: 99%

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

Akatsuka

Gao

Aji

et al. 2023

Preprint

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Magnetic materials with highly anisotropic chemical bonding can be exfoliated to realize ultrathin sheets or interfaces with highly controllable optical or spintronics responses, while also promising novel cross-correlation phenomena between electric polarization and the magnetic texture. The vast majority of these van-der-Waals magnets 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 use polarized neutron scattering to reveal cycloidal, or conical, magnetic structures in DyTe3, where insulating double-slabs of dysprosium square nets are separated by highly metallic tellurium layers. We identify a hierarchy of energy scales with - in order of decreasing strength - antiferromagnetic exchange interactions, magnetocrystalline anisotropy, and periodic modulations of the exchange energy. The latter are attributed to magneto-elastic coupling to the unconventional charge order in DyTe3. This easily cleavable metallic helimagnet also hosts a complex magnetic phase diagram indicative of competing interactions. Our work paves the way for twistronics research, where helimagnetic layers can be combined to form complex spin textures on-demand, using the vast family of rare earth chalcogenides and beyond.

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Section: Main Textmentioning

confidence: 99%

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

Akatsuka

Gao

Aji

et al. 2023

Preprint

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

Akatsuka,

Esser,

Okumura

et al. 2024

Nat Commun

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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.

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