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arXiv · 2503.22009

Emergent Hidden Multipolar State in the Triangular Lattice Magnet TmZn2GaO5

Matthew Ennis·Rabindranath Bag·Tessa Cookmeyer·Matthew B. Stone·Alexander I. Kolesnikov·Tao Hong·Leon Balents·Sara Haravifard
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Abstract

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.

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Matthew Ennis, Rabindranath Bag, Tessa Cookmeyer, Matthew B. Stone, Alexander I. Kolesnikov, Tao Hong, Leon Balents, Sara Haravifard. 2025-03-27. Emergent Hidden Multipolar State in the Triangular Lattice Magnet TmZn2GaO5. https://arxiv.org/abs/2503.22009

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