Related Experiment Video
Updated: Oct 9, 2025
10:36
Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
Published on: January 21, 2016
10.7K
Above-ordering-temperature large anomalous Hall effect in a triangular-lattice magnetic semiconductor.
Masaki Uchida1,2,3, Shin Sato2, Hiroaki Ishizuka1
1Department of Physics, Tokyo Institute of Technology, Tokyo 152-8550, Japan.
Science Advances
|December 22, 2021
Summary
This study reveals that magnetic semiconductor EuAs exhibits a large anomalous Hall effect (AHE) above its ordering temperature, driven by spin cluster scattering. This finding opens new avenues for materials with significant Hall response.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid-State Physics
Background:
- Anomalous Hall effect (AHE) research traditionally focused on intrinsic mechanisms.
- Extrinsic mechanisms, like spin cluster scattering, are theorized to enhance AHE in specific magnetic semiconductors.
Purpose of the Study:
- To investigate the potential of magnetic semiconductors for large AHE beyond intrinsic effects.
- To explore the extrinsic mechanism of spin cluster scattering in inducing AHE.
Main Methods:
- Experimental characterization of the magnetic semiconductor EuAs.
- Measurement of AHE and colossal magnetoresistance.
- Theoretical model calculations to explain observed phenomena.
Main Results:
- EuAs, a novel magnetic semiconductor, displays a significant AHE with an anomalous Hall angle of 0.13.
- Large AHE was observed at temperatures well above the antiferromagnetic ordering point.
- Colossal magnetoresistance was also detected in EuAs.
Conclusions:
- Spin cluster scattering in a hopping regime effectively explains the observed AHE in EuAs.
- EuAs serves as a promising material for studying topological spin textures and AHE.
- Findings support the development of materials with diluted carriers coupled to noncoplanar spin structures for enhanced AHE.
Related Concept Videos
01:30The Hall Effect
2.8K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
2.8K
01:30Paramagnetism
2.6K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.6K
01:31Ferromagnetism
2.5K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.5K
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
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
01:28Types Of Superconductors
1.2K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
1.2K