Publication detail

Temperature Dependence of Relativistic Valence Band Splitting Induced by an Altermagnetic Phase Transition

HAJLAOUI, M. WILFRED D'SOUZA, S. ŠMEJKAL, L. KRIEGNER, D. KRIZMAN, G. ZAKUSYLO, T. OLSZOWSKA, N. CAHA, O. MICHALIČKA, J. SÁNCHEZ-BARRIGA, J. MARMODORO, A. VÝBORNÝ, K. ERNST, A. CINCHETTI, M. MINÁR, J. JUNGWIRTH, T. SPRINGHOLZ, G.

Original Title

Temperature Dependence of Relativistic Valence Band Splitting Induced by an Altermagnetic Phase Transition

Type

journal article in Web of Science

Language

English

Original 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

Keywords

altermagnetism; angle-resolved photoemission spectroscopy; electronic band structure; spintronics

Authors

HAJLAOUI, M.; WILFRED D'SOUZA, S.; ŠMEJKAL, L.; KRIEGNER, D.; KRIZMAN, G.; ZAKUSYLO, T.; OLSZOWSKA, N.; CAHA, O.; MICHALIČKA, J.; SÁNCHEZ-BARRIGA, J.; MARMODORO, A.; VÝBORNÝ, K.; ERNST, A.; CINCHETTI, M.; MINÁR, J.; JUNGWIRTH, T.; SPRINGHOLZ, G.

Released

1. 8. 2024

Publisher

WILEY-V C H VERLAG GMBH

Location

WEINHEIM

ISBN

1521-4095

Periodical

ADVANCED MATERIALS

Year of study

36

Number

31

State

Federal Republic of Germany

Pages from

1

Pages to

8

Pages count

8

URL

https://onlinelibrary.wiley.com/doi/10.1002/adma.202314076

Full text in the Digital Library

http://hdl.handle.net/11012/250179

BibTex

@article{BUT190000,
  author="Mahdi {Hajlaoui} and Sunil {Wilfred D'Souza} and Libor {Šmejkal} and Dominik {Kriegner} and Gauthier {Krizman} and Tetiana {Zakusylo} and Natalia {Olszowska} and Ondřej {Caha} and Jan {Michalička} and Jaime {Sánchez-Barriga} and Alberto {Marmodoro} and Karel {Výborný} and Arthur {Ernst} and Mirko {Cinchetti} and Ján {Minár} and Tomáš {Jungwirth} and Gunther {Springholz}",
  title="Temperature Dependence of Relativistic Valence Band Splitting Induced by an Altermagnetic Phase Transition",
  journal="ADVANCED MATERIALS",
  year="2024",
  volume="36",
  number="31",
  pages="8",
  doi="10.1002/adma.202314076",
  issn="1521-4095",
  url="https://onlinelibrary.wiley.com/doi/10.1002/adma.202314076"
}