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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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Field-tuned quantum effects in a triangular-lattice Ising magnet.

Yayuan Qin1, Yao Shen2, Changle Liu1

  • 1State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.

Science Bulletin
|December 22, 2022
PubMed
Summary

We discovered a unique magnetic state in TmMgGaO4, driven by quantum fluctuations and frustrated interactions. This quantum magnet exhibits unusual field and temperature effects on its magnetic order and excitation gap.

Keywords:
Magnetic frustrationNeutron scatteringQuantum magnetTransverse field Ising model

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Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism
  • Materials Science

Background:

  • Understanding quantum fluctuations is key in novel magnetic materials.
  • Frustrated interactions in triangular lattices lead to complex magnetic behaviors.

Purpose of the Study:

  • Investigate the magnetic properties of the triangular-lattice quantum Ising magnet TmMgGaO4.
  • Characterize the field and temperature dependence of magnetic order and excitation gaps.

Main Methods:

  • Thermodynamic measurements.
  • Neutron scattering experiments.
  • Semi-classical calculations.

Main Results:

  • Observed a quasi-plateau state induced by quantum fluctuations.
  • Found unconventional non-monotonic field and temperature dependence.
  • Identified a disordered state with magnon-like excitations in high fields.

Conclusions:

  • Quantum fluctuations and frustrated Ising interactions govern the observed magnetic behaviors.
  • The study provides quantitative understanding of these competing interactions.