Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: Frustrated Magnets - Spin Liquids 2 (joint session TT/MA)
TT 30.5: Talk
Tuesday, March 17, 2020, 15:00–15:15, HSZ 304
Single-site magnetic anisotropy governed by interlayer cation charge imbalance in triangular-lattice AYbX2 — •Ziba Zangenehpourzadeh, Stanislav Avdoshenko, Jeroen van den Brink, and Liviu Hozoi — IFW Dresden, 01069 Dresden, Germany
The behavior in magnetic field of a paramagnetic center is characterized by its g tensor. Here we shed light on the anisotropy of the g tensor of Yb3+ 4f13 ions in NaYbX2 and NaYbO2, layered triangular-lattice materials suggested to host spin-liquid ground states. Using quantum chemical calculations we show that, even if the ligand-cage trigonal distortions are significant in these systems, the decisive role in realizing strongly anisotropic, g factors is played by interlayer cation charge imbalance effects. The latter refer to the asymmetry experienced by a given Yb center due to having higher ionic charges at adjacent metal sites within the magnetic ab layer. This should be a rather general feature of 4f13 layered delafossites: less interlayer positive charge is associated with stronger in-plane magnetic response [1].
[1] Z. Zangeneh, et al, Phys. Rev. B 100, 174436 (2019).