TmZn2GaO5 is a newly synthesized triangular lattice magnet that exhibits a unique quantum phase characterized by strong Ising anisotropy, a pseudo-doublet crystal electric field ground state, and a low-energy gapped excitation at the K point. Unlike its well-known counterparts, TmMgGaO4 and YbMgGaO4, this material crystallizes in a distinct hexagonal structure, leading to a cleaner platform for investigating frustrated magnetism. Magnetic susceptibility, heat capacity, and inelastic neutron scattering measurements confirm the absence of long-range magnetic order down to 50 mK, placing TmZn2GaO5 in a distinct region of the transverse-field Ising model phase diagram. Theoretical calculations based on spin-wave theory and mean-field modeling reproduce key experimental observations, reinforcing the material's placement in a quantum disordered/multipolar state. These results highlight its potential for exploring quantum disordered states, anisotropic excitations, and exotic quantum phases in frustrated spin systems.
@article{arxiv.2503.22009,
title = {Emergent Hidden Multipolar State in the Triangular Lattice Magnet TmZn2GaO5},
author = {Matthew Ennis and Rabindranath Bag and Tessa Cookmeyer and Matthew B. Stone and Alexander I. Kolesnikov and Tao Hong and Leon Balents and Sara Haravifard},
journal= {arXiv preprint arXiv:2503.22009},
year = {2025}
}