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, α-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 α-MnTe as the temperature decreases. This sheds light on a previously unexplored facet of this intriguing material.

Central European Institute of Technology Brno University of Technology Purkyňova 123 Brno 61200 Czech Republic

Department of Condensed Matter Physics Masaryk University Kotlářská 267 2 Brno 61137 Czech Republic

Department of Physics TU Dortmund University 44227 Dortmund Germany

Helmholtz Zentrum Berlin für Materialien und Energie Albert Einstein Strasse 15 12489 Berlin Germany

IMDEA Nanoscience C Faraday 9 Campus de Cantoblanco Madrid 28049 Spain

Institute for Theoretical Physics Johannes Kepler University Linz 4040 Austria

Institute of Physics Czech Academy of Sciences Cukrovarnická 10 Praha 16200 Czech Republic

Institute of Physics Johannes Gutenberg University Mainz D 55099 Mainz Germany

Institute of Semiconductors and Solid State Physics Johannes Kepler University Linz 4040 Austria

National Synchrotron Radiation Centre SOLARIS Jagiellonian University Czerwone Maki 98 Krakow 30 392 Poland

School of Physics and Astronomy University of Nottingham Nottingham NG7 2RD UK

University of West Bohemia New Technologies Research Center Pilsen 30100 Czech Republic

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