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TT: Fachverband Tiefe Temperaturen

TT 46: Frustrated Magnets: Spin Liquids

TT 46.8: Vortrag

Donnerstag, 30. März 2023, 11:30–11:45, HSZ 201

Delafossite magnet AgCrSe₂: frustration, short range correlations, and field-tuned anisotropic order — •Michael Baenitz¹, S. Luther^2,3, M. Piva¹, J. Sichelschmidt¹, M. Nicklas¹, H. Zhang¹, B. Schmidt¹, H. Rosner¹, D. Khalyavin⁴, P. Manuel⁴, J. Wosnitza^2,3, H. Kuehne², and M. Schmidt¹ — ¹MPI for Chemical Physics of Solids, D-01187 Dresden, Germany — ²Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany — ³Institut für Festkörper- und Materialphysik, TU Dresden, 01062 Dresden Germany — ⁴ISIS Neutron and Muon Source, Rutherford Appelton Laboratory, Chilton, Didcot OX11 OQX, United Kingdom

In contrast to Cr based oxy delafossites (DFs) with predominant antiferromagnetic (afm) nearest neighbor (nn) interaction in the Heisenberg triangular lattice, AgCrSe₂ as a non oxy DFs member is characterized by competing interactions (ferromagnetic nn- vs afm third neighbor interaction). Due to this, the magnetism, can be tuned by relatively small magnetic fields, allowing us to probe the H-T phase diagram in great detail. Large single crystals are grown by chemical vapor transport and studied by magnetization, specific heat, and thermal expansion and Cr-electron spin resonance and neutron diffraction as local probes. An anisotropic cycloidal ordering with unusual extended two-dimensional fluctuations is found [1]. The impact of antisymmetric interactions (Dzyaloshinskii-Moriya) due to the noncentrosymmetric polar space group (R3m) is discussed.
[1] M. Baenitz et al. PRB 104, 134410 (2021)