| Autor: |
Sayantika Bhowal, Nicola A. Spaldin |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Physical Review X, Vol 14, Iss 1, p 011019 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2160-3308 |
| DOI: |
10.1103/PhysRevX.14.011019 |
| Popis: |
We show that time-reversal symmetry-broken, centrosymmetric antiferromagnets with nonrelativistic spin splitting of d-wave symmetry—the so-called d-wave altermagnets—are conveniently described in terms of the ferroic ordering of magnetic octupoles. The magnetic octupoles are the lowest-order ferroically ordered magnetic quantity in this case and so are the natural order parameter for the transition into the magnetically ordered state. They provide a unified description of the broken time-reversal symmetry and the nonrelativistic spin splitting, as well as a platform for manipulating the latter, and account for other phenomena, such as piezomagnetism, characteristic of this class of antiferromagnets. Unusually for antiferromagnets, we show that the magnetic octupoles cause a nonzero magnetic Compton scattering, providing a route for their direct experimental detection. We illustrate these concepts using density-functional and model calculations for the prototypical nonrelativistic spin-split antiferromagnet, rutile-structure manganese difluoride MnF_{2}. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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