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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
Published on: January 21, 2016
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Intrinsic Nonlinear Hall Effect in Antiferromagnetic Tetragonal CuMnAs
Chong Wang1, Yang Gao2,3, Di Xiao1
1Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
Physical Review Letters
|January 21, 2022
Summary
Detecting Néel vector orientation is key in antiferromagnetic spintronics. The intrinsic nonlinear Hall effect offers a novel, relaxation-time-independent method for this detection in materials like CuMnAs.
Area of Science:
- Condensed Matter Physics
- Spintronics
- Materials Science
Background:
- Detecting Néel vector orientation is crucial for antiferromagnetic spintronics applications.
- Existing methods may be limited by factors like relaxation time.
Purpose of the Study:
- To identify and characterize a novel method for detecting Néel vector orientation.
- To investigate the intrinsic nonlinear Hall effect as a tool for antiferromagnetic spintronics.
Main Methods:
- Theoretical identification of the intrinsic nonlinear Hall effect.
- Experimental study of the intrinsic nonlinear Hall effect in tetragonal CuMnAs.
- Analysis of conductivity dependence on chemical potential and temperature.
Main Results:
- The intrinsic nonlinear Hall effect is identified as a time-reversal-odd conductivity, independent of relaxation time.
- Tetragonal CuMnAs exhibits significant intrinsic nonlinear Hall conductivity (mA/V²).
- The effect shows strong temperature dependence and can be explained by a tilted massive Dirac model.
Conclusions:
- The intrinsic nonlinear Hall effect provides a robust method for detecting Néel vector reversal.
- CuMnAs is a promising material for exploiting this effect.
- A survey of magnetic point groups offers guidance for discovering new materials.
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