Related Experiment Video
Updated: Oct 19, 2025
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.3K
Field-induced quantum spin disordered state in spin-1/2 honeycomb magnet Na2Co2TeO6
Gaoting Lin1, Jaehong Jeong2,3, Chaebin Kim2,4
1Key Laboratory of Artificial Structures and Quantum Control, Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China.
Nature Communications
|September 22, 2021
Summary
Researchers studied Na2Co2TeO6 (NCTO), a 3d honeycomb magnet, revealing a field-induced spin disordered state. This finding expands the Kitaev model to 3d materials, highlighting spin-orbital effects in quantum magnetism.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
- Materials Science
Background:
- Spin-orbit coupled honeycomb magnets with Kitaev interactions are key to understanding exotic quantum states like quantum spin liquids.
- While 4d/5d-based magnets dominate Kitaev system research, 3d-based alternatives are gaining attention.
- Na2Co2TeO6 (NCTO) was theoretically proposed as a potential 3d Kitaev system.
Purpose of the Study:
- To investigate the quantum magnetism of Na2Co2TeO6 (NCTO) using experimental and computational methods.
- To identify potential Kitaev interactions and exotic quantum states within this 3d honeycomb magnet.
- To explore the behavior of NCTO under an applied magnetic field.
Main Methods:
- Experimental techniques included heat capacity, magnetization, and electron spin resonance (ESR) measurements.
- Inelastic neutron scattering (INS) was employed to probe magnetic excitations.
- INS spectra were simulated to determine exchange interactions.
Main Results:
- A field-induced spin disordered state was observed in NCTO within a specific magnetic field range (7.5 T < B < 10.5 T, applied perpendicular to the b-axis).
- Experimental data and simulations provided insights into the magnetic interactions within NCTO.
- NCTO exhibits characteristics of an effective spin-1/2 honeycomb lattice.
Conclusions:
- Na2Co2TeO6 (NCTO) emerges as a significant 3d material exhibiting a field-induced disordered state, expanding the scope of Kitaev model research.
- The study underscores the importance of spin-orbital coupling in 3d quantum magnets.
- NCTO provides a new platform for exploring quantum magnetism and potential quantum spin liquid states in 3d systems.
Related Concept Videos
01:03Atomic Nuclei: Nuclear Spin State Overview
1.3K
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...
1.3K
03:02Colors and Magnetism
12.5K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.5K
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
1.4K
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.
1.4K
01:23Atomic Nuclei: Nuclear Relaxation Processes
776
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.
776
00:59Atomic Nuclei: Nuclear Magnetic Moment
2.2K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
2.2K
02:42Valence Bond Theory
9.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
9.8K