Related Experiment Video
Updated: Mar 19, 2026
08:55
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
9.0K
Large anomalous Nernst effect in a skyrmion crystal
Yo Pierre Mizuta1, Fumiyuki Ishii2
1Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, 920-1192 Japan.
Scientific Reports
|June 17, 2016
Summary
Thermoelectric properties of skyrmion crystals were investigated. Large anomalous Hall conductivity in these systems suggests potential for efficient thermoelectric materials via the anomalous Nernst effect.
Area of Science:
- Condensed matter physics
- Materials science
- Spintronics
Background:
- Skyrmion crystals exhibit unique spin textures.
- Thermoelectric materials convert heat to electricity.
- Anomalous Nernst effect relates to spin structure and transverse voltage.
Purpose of the Study:
- Investigate thermoelectric properties of a model skyrmion crystal.
- Explore the link between spin structure and thermoelectric voltage.
- Identify potential thermoelectric applications of skyrmion systems.
Main Methods:
- Theoretical investigation of a model skyrmion crystal.
- Analysis of anomalous Hall conductivity and Chern numbers.
- First-principles calculations to explore material properties.
Main Results:
- Large anomalous Hall conductivity observed, linked to large Chern numbers.
- Peculiar spin structure induces significant transverse thermoelectric voltage.
- Demonstrated potential for high thermoelectric performance in skyrmions.
Conclusions:
- Skyrmion systems show promise as novel thermoelectric materials.
- The anomalous Nernst effect is a key mechanism for thermoelectricity in skyrmions.
- First-principles calculations are effective for discovering such materials.
More Related Videos
Related Concept Videos
01:26Imperfections in Crystal Structure: Stoichiometric Point Defects
58
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
58
02:58Crystal Field Theory - Octahedral Complexes
31.6K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
31.6K
00:59Atomic Nuclei: Nuclear Magnetic Moment
3.5K
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...
3.5K
01:14π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
2.0K
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
2.0K
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
2.5K
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.
2.5K
01:05Atomic Nuclei: Magnetic Resonance
1.4K
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
1.4K