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Observation of a spontaneous anomalous Hall response in the Mn 5 Si 3 d-wave altermagnet candidate.

Authors :
Reichlova H
Lopes Seeger R
González-Hernández R
Kounta I
Schlitz R
Kriegner D
Ritzinger P
Lammel M
Leiviskä M
Birk Hellenes A
Olejník K
Petřiček V
Doležal P
Horak L
Schmoranzerova E
Badura A
Bertaina S
Thomas A
Baltz V
Michez L
Sinova J
Goennenwein STB
Jungwirth T
Šmejkal L
Source :
Nature communications [Nat Commun] 2024 Jun 11; Vol. 15 (1), pp. 4961. Date of Electronic Publication: 2024 Jun 11.
Publication Year :
2024

Abstract

Phases with spontaneous time-reversal ( T ) symmetry breaking are sought after for their anomalous physical properties, low-dissipation electronic and spin responses, and information-technology applications. Recently predicted altermagnetic phase features an unconventional and attractive combination of a strong T -symmetry breaking in the electronic structure and a zero or only weak-relativistic magnetization. In this work, we experimentally observe the anomalous Hall effect, a prominent representative of the T -symmetry breaking responses, in the absence of an external magnetic field in epitaxial thin-film Mn <subscript>5</subscript> Si <subscript>3</subscript> with a vanishingly small net magnetic moment. By symmetry analysis and first-principles calculations we demonstrate that the unconventional d-wave altermagnetic phase is consistent with the experimental structural and magnetic characterization of the Mn <subscript>5</subscript> Si <subscript>3</subscript> epilayers, and that the theoretical anomalous Hall conductivity generated by the phase is sizable, in agreement with experiment. An analogy with unconventional d-wave superconductivity suggests that our identification of a candidate of unconventional d-wave altermagnetism points towards a new chapter of research and applications of magnetic phases.<br /> (© 2024. The Author(s).)

Details

Language :
English
ISSN :
2041-1723
Volume :
15
Issue :
1
Database :
MEDLINE
Journal :
Nature communications
Publication Type :
Academic Journal
Accession number :
38862514
Full Text :
https://doi.org/10.1038/s41467-024-48493-w