Kavli Affiliate: Leon Balents
| First 5 Authors: Matthew Ennis, Rabindranath Bag, Tessa Cookmeyer, Matthew B. Stone, Alexander I. Kolesnikov
| Summary:
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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