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Close Proximity to a Quantum Phase Transition in TmZn_{2}GaO_{5}.
Matthew Ennis1, Rabindranath Bag1, Tessa Cookmeyer2
1Duke University, Department of Physics, Durham, North Carolina, USA.
Physical Review Letters
|July 10, 2026
Summary
Newly synthesized TmZn_{2}GaO_{5} exhibits a unique quantum phase with strong Ising anisotropy. It shows no magnetic order, suggesting a quantum disordered state ideal for frustrated magnetism research.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
- Materials Science
Background:
- Frustrated magnetism in triangular lattices presents complex quantum phenomena.
- Thulium-based magnets like TmMgGaO_{4} and YbMgGaO_{4} are known for exploring exotic magnetic states.
- Understanding novel materials is key to advancing quantum physics.
Purpose of the Study:
- To synthesize and characterize TmZn_{2}GaO_{5}, a novel triangular lattice magnet.
- To investigate its magnetic properties, crystal structure, and quantum phase behavior.
- To explore its potential for studying frustrated magnetism and quantum critical phenomena.
Main Methods:
- Synthesis of TmZn_{2}GaO_{5} and crystallographic analysis.
- Magnetic susceptibility and heat capacity measurements.
- Inelastic neutron scattering and theoretical modeling (spin-wave theory, mean-field).
Main Results:
- TmZn_{2}GaO_{5} crystallizes in a unique hexagonal structure, distinct from related compounds.
- No long-range magnetic order was observed down to 50 mK, indicating a quantum disordered state.
- Experimental and theoretical results place it in a unique region of the transverse-field Ising model phase diagram.
Conclusions:
- TmZn_{2}GaO_{5} is a novel material for studying frustrated magnetism and quantum disordered states.
- Its strong Ising anisotropy and gapped excitations offer a unique platform for quantum phase exploration.
- The material provides insights into quantum criticality and multipolar states in magnetic systems.
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