Temperature Dependence of Relativistic Valence Band Splitting Induced by an Altermagnetic Phase Transition
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Date
2024-08-01
Authors
Hajlaoui, Mahdi
Wilfred D'Souza, Sunil
Šmejkal, Libor
Kriegner, Dominik
Krizman, Gauthier
Zakusylo, Tetiana
Olszowska, Natalia
Caha, Ondřej
Michalička, Jan
Sánchez-Barriga, Jaime
ORCID
0000-0001-6231-0061Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
WILEY-V C H VERLAG GMBH
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Abstract
Altermagnetic (AM) materials exhibit non-relativistic, momentum-dependent spin-split states, ushering in new opportunities for spin electronic devices. While the characteristics of spin-splitting are documented within the framework of the non-relativistic spin group symmetry, there is limited exploration of the inclusion of relativistic symmetry and its impact on the emergence of a novel spin-splitting in the band structure. This study delves into the intricate relativistic electronic structure of an AM material, alpha-MnTe. Employing temperature-dependent angle-resolved photoelectron spectroscopy across the AM phase transition, the emergence of a relativistic valence band splitting concurrent with the establishment of magnetic order is elucidated. This discovery is validated through disordered local moment calculations, modeling the influence of magnetic order on the electronic structure and confirming the magnetic origin of the observed splitting. The temperature-dependent splitting is ascribed to the advent of relativistic spin-splitting resulting from the strengthening of AM order in alpha-MnTe as the temperature decreases. This sheds light on a previously unexplored facet of this intriguing material. Altermagnets exhibit momentum-dependent spin-split states providing new opportunities for spin electronic devices. Through temperature-dependent angle-resolved photoemission spectroscopy and disordered local moment calculations, it is demonstrated that the relativistic valence band splitting of the prototypical MnTe altermagnet is of magnetic origin. This is attributed to a novel relativistic spin-splitting phenomenon concurrent with the establishment of the altermagnetic order below the N & eacute;el temperature. image
Description
Citation
ADVANCED MATERIALS. 2024, vol. 36, issue 31, p. 1-8.
https://onlinelibrary.wiley.com/doi/10.1002/adma.202314076
https://onlinelibrary.wiley.com/doi/10.1002/adma.202314076
Document type
Peer-reviewed
Document version
Published version
Date of access to the full text
Language of document
en