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TT: Fachverband Tiefe Temperaturen

TT 29: Frustrated Magnets: General

TT 29.4: Talk

Wednesday, March 29, 2023, 10:15–10:30, HSZ 201

Temperature-dependent transitions of the rare-earth delafossite NaGdS₂ — •Justus Grumbach¹, Mathias Doerr¹, Ellen Haeussler², and Sergey Granovsky¹ — ¹Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany — ²Fakultät für Chemie und Lebensmittelchemie, Technische Universität Dresden, 01062 Dresden, Germany

Rare-earth delafossites are materials containing ideal triangular magnetic planes, which are frustrated. Due to their properties, rare-earth delafossites are promising candidates for a QSL ground state. In recent years this state occured in some S=1/2-delafossites with transitions in the mK range.
Now a number of own new measurements were made on NaGdS₂ single crystals. This delafossite with magnetic Gd³⁺ ions, which has been extensively investigated for the first time, is of special interest due to the pure spin moment J=S=7/2. Measurements of several different thermodynamic and magnetic properties were performed on very small samples (size ∼ µm) down to lowest temperatures (40 mK).
Essential physical data could be extracted, which show correspondingly a AFM-groundstate below ∼250 mK, which is kind of expected. An additionally investigated modification at 60 K, indicating an anisotropy in the system, is still under theoretical debate and will form a main part of the talk.