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MA: Fachverband Magnetismus

MA 21: Phd Focus Session: Altermagnets: Foundations and Experimental Evidence

MA 21.2: Invited Talk

Wednesday, March 20, 2024, 10:00–10:30, H 1058

Experimental evidence of time-reversal symmetry breaking in altermagnetic RuO2 — •O. Fedchenko1, J. Minar2, A. Akashdeep1, S.W. D’Souza2, D. Vasilyev1, O. Tkach1, L. Odenbreit1, Y. Lytvynenko1, Q. Nguyen3, D. Kutnyakhov4, N. Wind4, L. Wenthaus4, M. Scholz4, K. Rossnagel5,4, M. Hoesch4, M. Aeschlimann6, B. Stadtmüller1, M. Kläui1, G. Schönhense1, T. Jungwirth7,8, A. Birk Hellenes1, G. Jakob1, L. Šmejkal1,7, J. Sinova1,7, and H.-J. Elmers11JGU Mainz, Germany — 2NTC UWB, Czech Republic — 3SLAC, USA — 4DESY Hamburg, Germany — 5CAU Kiel, Germany — 6RPTU, Kaiserslautern, Germany — 7Institute of Physics ASCR, Czech Republic — 8University of Nottingham, UK

Our experimental study focuses on epitaxial RuO2, the material of the altermagnetic (AM) class. This class has been predicted to combine properties of ferromagnets (FMs) and antiferromagnets (AFMs). Thus, like AFMs, AMs exhibit compensated magnetic order, and moreover, like FMs, they promote strong spin polarization in the band structure [1]. The corresponding unconventional mechanism is the time-reversal symmetry breaking without magnetization − the primary signature of AMs. Using time-of-flight momentum microscopy, we have spectroscopically measured the key signature of the AM phase, i.e. a magnetic circular dichroism (MCD), for the collinear compensated altermagnet RuO2 [2].

[1] L. Šmejkal et al., Phys. Rev. X 12, 011028 (2022).

[2] O. Fedchenko et al., arXiv 2306.02170v1 (2023).

Keywords: Altermagnetism; Time-reversal symmetry breaking; RuO2

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