Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Frustrated Magnets - General
TT 23.5: Vortrag
Mittwoch, 7. September 2022, 16:00–16:15, H22
NMR and magnetization studies of helical correlations within the stretched diamond lattice of LiYbO2 — •S. Luther1,2, S. Wilson3, M. M. Bordelon3, J. Wosnitza1,2, M. Baenitz4, and H. Kühne1 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3University of California, Santa Barbara, USA — 4MPI for Chemical Physics of Solids, Dresden, Germany
The Yb-based delafossite LiYbO2 hosts a stretched diamond lattice. The resulting three-dimensional geometric frustration is in strong contrast to the recently reported 2D-type Yb-based triangular-lattice delafossites. Further, the combination of a strong spin-orbit coupling together with crystalline-electric-field effects leads to a pseudospin-1/2 ground state of the Yb3+ ions. A recent study of LiYbO2 by means of specific heat and neutron powder diffraction established the formation of helical order with non-trivial phasing between the two interpenetrating Yb sublattices below 1.1 K [1]. In order to further explore the H-T phase diagram and magnetic correlations, we performed low-temperature magnetometry and 7Li NMR of polycrystalline LiYbO2. Our magnetometry and 1/T1 NMR data are fully consistent with the reported specific-heat results. The 7Li NMR spectroscopy yields a monotonic and asymmetric spectral broadening towards low temperatures in the paramagnetic state. In the helical ordered state, a spontaneous and pronounced increase of the spectral width is observed, in agreement with the neutron-diffraction experiments.
[1] Bordelon et al., Phys. Rev. B 103, 014420 (2021)