Emerging Research Landscape of Altermagnetism
By L. Šmejkal, J. Sinova, T. Jungwirth. Physical Review X, 2022
1,191 citations recorded by the source corpus.
Magnetism is one of the largest, most fundamental, and technologically most relevant fields of condensed-matter physics. Traditionally, two basic magnetic phases have been considered – ferromagnetism and antiferromagnetism. The breaking of the time-reversal symmetry and spin splitting of the electronic states by the magnetization in ferromagnets underpins a range of macroscopic responses in this extensively explored and exploited type of magnets. By comparison, antiferromagnets have vanishing net magnetization. This Perspective reflects on recent observations of materials hosting an intriguing ferromagnetic-antiferromagnetic dichotomy, in which spin-split spectra and macroscopic observables, akin to ferromagnets, are accompanied by antiparallel magnetic order with vanishing magnetization, typical of antiferromagnets. An unconventional non-relativistic symmetry-group formalism offers a resolution of this apparent contradiction by delimiting a third basic magnetic phase, dubbed altermagnetism. Our Perspective starts with an overview of the still emerging unique phenomenology of the phase, and of the wide array of altermagnetic material candidates. In the main part of the article, we illustrate how altermagnetism can enrich our understanding of overarching condensed-matter physics concepts, and have impact on prominent condensed-matter research areas.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/a5c8af2f72fad799c7d355f9b4910260f46c98df
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Citations in the corpus
- Absence of magnetic order in RuO2: insights from μSR spectroscopy and neutron diffraction (2024, background): “Altermagnetism, a magnetic state of matter that shares properties with both conventional ferro-and antiferromag-nets [1, 2], has recently garnered considerable attention.”
- Altermagnetism in MnTe: Origin, predicted manifestations, and routes to detwinning (2023, neutral): “In the former, the stacking sequence is AbAc, and the structure is expanded in the direction perpendicular to the triangular planes, and squeezed in the planes (Fig.”
- A metallic room-temperature d-wave altermagnet (2024, neutral): “The collinear magnetic structure corresponds to unconventional altermagnetism, leading to momentum-dependent spin splitting in electronic bands [1,2].”
- Crystal-symmetry-paired spin–valley locking in a layered room-temperature metallic altermagnet candidate (2024, neutral): “Here we demonstrate crystal-symmetry-paired spin–valley locking in a layered room-temperature antiferromagnetic compound, Rb 1− δ V 2 Te 2 O. Spin-resolved photoemission measurements directly show the opposite spin splitting between crystal-symmetry-paired valleys.”
- Topological transition from nodal to nodeless Zeeman splitting in altermagnets (2023, background): “To shed further light on the nature of altermagnetism, and on its connection with other concepts of many-body electronic systems [3], it is useful to consider the special case of an isotropic system, for which d (r̂) can be expressed in terms of spherical harmonics Ylm (r̂).”
- Two-dimensional altermagnets: Superconductivity in a minimal microscopic model (2023, background): “Altermagnets constitute a new subclass of magnetic materials [1].”