Emerging research landscape of altermagnetism
Libor \v{S}mejkal, Jairo Sinova, Tomas Jungwirth

TL;DR
This paper discusses altermagnetism, a newly identified magnetic phase that exhibits ferromagnetic-like spin splitting without net magnetization, expanding the understanding of magnetic phenomena in condensed matter physics.
Contribution
It introduces altermagnetism as a third fundamental magnetic phase, supported by a novel symmetry-group formalism, and explores its phenomenology and potential material candidates.
Findings
Identification of altermagnetism as a distinct magnetic phase
Explanation of spin-split spectra with zero net magnetization
Potential impact on condensed-matter physics research areas
Abstract
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…
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Taxonomy
TopicsMagnetic and transport properties of perovskites and related materials · Physics of Superconductivity and Magnetism · Advanced Condensed Matter Physics
