Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Poster

TT 37.24: Poster

Mittwoch, 19. März 2025, 15:00–18:00, P4

ESR Investigations of AgCrSe₂, AgCrS₂ and Cr₃Se₄ — •Jörg Sichelschmidt, Pierre Chailloleau, Michael Baenitz, Seo-Jin Kim, Helge Rosner, Vicky Hasse, and Marcus Schmidt — Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany

We investigated the Electron Spin Resonance (ESR) of Cr in the layered triangular lattice systems AgCrSe₂, AgCrS₂ and the structurally related Cr₃Se₄. These materials display a variety of interesting physical properties such as unconventional magnetic ordering [1], a spin-polarized surface state [2], an unconventional anomalous Hall effect [3] in AgCrSe₂ or multiferroic behavior in AgCrS₂, or directional Kondo transport [4]. At low temperatures, all these materials show a divergent ESR spin relaxation, which is typical for low-dimensional spin systems and indicates an increasing importance of Cr³⁺ spin correlations. This also leads to the formation of internal fields, as evidenced by the marked decrease in the resonance field. The relatively narrow Cr³⁺ ESR spectra allow to determine an ESR intensity which reflects the static susceptibility probed locally at the site of the Cr spins.

[1] M. Baenitz et al., Phys. Rev. B 104, 134410 (2021);

[2] G.-R. Siemann et al., npj Quantum Mater. 8, 61 (2023);

[3] S.-J. Kim et al., Adv. Sci. 11, 2307306 (2024);

[4] J. Guimaraes et al., Commun. Phys. 7, 176 (2024).

Keywords: triangular lattice; ESR