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Updated: Feb 25, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Published on: March 24, 2019

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六个状态的时钟物理学在一个原子薄的反铁磁体中

Frank Y Gao1, Dong Seob Kim1, Chao Lei1

  • 1Department of Physics and Center for Complex Quantum Systems, The University of Texas at Austin, Austin, TX, USA.

Nature materials
|February 23, 2026
PubMed
概括

研究人员研究了NiPS3中的2D XY模型,发现其磁性行为从单层中从3D过渡到2D Berezinskii-Kosterlitz-Thouless (BKT) 状态. 这种BKT阶段在低温下变得不稳定,形成长距离有序状态.

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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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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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