Regensburg 2019 – wissenschaftliches Programm
MA 6.9: Vortrag
Montag, 1. April 2019, 17:15–17:30, Theater
Field-induced magnetic transitions in the Yb- based Jeff =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 Jeff =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.