Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 6: Frustrated Magnets - Spin Liquids (joint session TT/MA)

MA 6.9: Vortrag

Montag, 1. April 2019, 17:15–17:30, Theater

Field-induced magnetic transitions in the Yb- based J_eff =1/2 triangular lattice antiferromagnet NaYbO₂ — •Kizhake Malayil Ranjith Kumar¹, Daryna Dmytriieva², Seunghyun Khim¹, Jörg Sichelschmidt¹, Hiroshi Yasuoka¹, Hannes Kühne², and Michael Baenitz¹ — ¹Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — ²Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, D-01314 Dresden, Germany

Spin-1/2 triangular lattice antiferromagnets (TLAF) are one of the active fields of research in condensed matter physics. The Yb³⁺- based delafossite NaYbO₂ provides an ideal J_eff =1/2 triangular lattice motif with spin-orbit entanglement. We have synthesized the phase pure polycrystalline NaYbO₂ material and investigated the ground state properties. At zero field, NaYbO₂ exhibits no sign of magnetic long-range order down to 0.35 K, which proposes a spin liquid like ground state with strong persisting quantum fluctuations. In external magnetic fields above 2 T, it yields field-induced ordered phases. We investigated the magnetic properties in detail by magnetization, specific heat, nuclear magnetic resonance (NMR), and electron spin resonance (ESR) experiments down to 0.35 K. The results are discussed within the extended XXZ model for bond-dependent exchange interactions on planar triangles.