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TT: Fachverband Tiefe Temperaturen
TT 61: Topology – Poster
TT 61.3: Poster
Mittwoch, 11. März 2026, 15:00–17:00, P4
Synthesis and characterisation of Yb-doped TlBiSe2 delafossite — •Manuel Schulze1, Isadora Neme2, Jörg Sichelschmidt2, Helge Rosner2, Michael Baenitz2, and Thomas Doert1 — 1Faculty of Chemistry and Food Chemistry, TUD Dresden University of Technology, 01062 Dresden — 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden
TlBiSe2 is a three-dimensional (3D) topological insulator with a unique single Dirac cone at the Brillouin-zone centre [1]. TlYbSe2 represents a prototype 2D triangular-lattice quantum spin liquid candidate [2]. Combining the two materials through partial substitution of Bi and Yb provides an interesting platform to investigate the interplay between unconventional electronic and magnetic properties.
Polycrystalline samples of the solid-solution series Tl(Bi,Yb)Se2 were synthesised by melting the elements
in a rotary setup to enhance homogenisation.
Powder X-ray diffraction and Rietveld refinement reveal systematic shifts in the lattice parameters, confirming continuous substitution.
First Electron Spin Resonance (ESR) measurements on Tl(Bi0.95Yb0.05)Se2 show metallic Yb3+ lines with hyperfine structure as expected for a magnetically diluted system.
Future work will additionally focus on NMR spectroscopy together with magnetisation and specific-heat
studies to analyze the evolution of magnetic and electronic correlations across the series.
[1] K. Kuroda et al., Phys. Rev. Lett. 105, 146801 (2010).
[2] T. Fujii et al., Phys. Rev. B 112, 024426 (2025).
Keywords: Dirac Semimetal; Topological insulator; Quantum Spin Liquid; NMR; ESR