Unconventional one-dimensional magnetic excitations in the Ti³⁺-based kagome antiferromagnet, Cs₈LiNa₃Ti₁₂F_48.

The geometrically frustrated, two-dimensional network of corner-sharing triangles in kagome antiferromagnets (AFMs) provides an ideal platform for realizing quantum spin liquid (QSL) states. While most known kagome QSL candidates are based on Cu²⁺ (3d⁹, s = ½) ions, non-copper-based systems remain largely unexplored. Recently, several new kagome compounds Cs₈AB₃Ti₁₂F₄₈, (A = Rb and Li, B = K and Na) were discovered where Ti³⁺ (3d¹, s = ½) ions are surrounded by six F^- ligands and form modulated kagome lattices. In this talk, we will present our time-of-flight neutron scattering data from a single crystal of Cs₈LiNa₃Ti₁₂F₄₈, which exhibits no phase transition down to 2 K, with strong antiferromagnetic interactions indicated by the Curie-Weiss temperature.  Notably, our data and analysis reveal a strikingly one-dimensional magnetic excitation pattern at low energies, with intensity concentrated along the (H00) direction in reciprocal space. We will also discuss how the magnetic interactions become one-dimensional in Cs₈LiNa₃Ti₁₂F₄₈.