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Article Dans Une Revue Nature Communications Année : 2024

Observation of a spontaneous anomalous Hall response in the Mn5Si3 d-wave altermagnet candidate

Anna Birk Hellenes
  • Fonction : Auteur
Kamil Olejník
  • Fonction : Auteur
Lukas Horak
Sylvain Bertaina
Vincent Baltz

Résumé

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 breakingresponses, in the absenceof anexternalmagnetic field in epitaxial thin-film Mn5Si3 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 Mn5Si3 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.
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Dates et versions

hal-03092623 , version 1 (11-06-2024)

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Helena Reichlová, Rafael Lopes Seeger, Rafael González-Hernández, Ismaila Kounta, Richard Schlitz, et al.. Observation of a spontaneous anomalous Hall response in the Mn5Si3 d-wave altermagnet candidate. Nature Communications, 2024, 15, pp.4961. ⟨10.1038/s41467-024-48493-w⟩. ⟨hal-03092623⟩
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