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Non-saturating quantum magnetization in Weyl semimetal TaAs.
Cheng-Long Zhang1, C M Wang2,3,4, Zhujun Yuan1
1International Center for Quantum Materials, School of Physics, Peking University, 100871, Beijing, China.
Nature Communications
|March 6, 2019
Summary
Researchers developed a new high-field thermodynamic method to detect relativistic quasiparticles in topological materials using magnetometry, observing unique non-saturating magnetic signals in Weyl semimetal TaAs.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Detecting spectroscopic signatures of relativistic quasiparticles in topological materials is key for their applications.
- Magnetometry is a powerful tool for studying electrons in solids, but a clear method for discerning relativistic quasiparticles is lacking.
Purpose of the Study:
- To establish a high-field thermodynamic method for detecting the magnetic response of relativistic quasiparticles.
- To investigate the magnetic properties of the Weyl semimetal TaAs in strong magnetic fields.
Main Methods:
- Utilized magnetic torque and parallel magnetization probes.
- Applied strong magnetic fields to the archetype Weyl semimetal TaAs.
- Developed a new magnetization calculation for Weyl fermion systems.
Main Results:
- Observed quasi-linear field-dependent effective transverse magnetization.
- Detected non-saturating parallel magnetization in the quantum limit.
- Non-saturating signals in TaAs differ from those of non-relativistic quasiparticles.
Conclusions:
- Established a high-field thermodynamic method for detecting relativistic quasiparticles.
- The observed magnetic responses in TaAs are consistent with Weyl fermion behavior.
- This method advances the study of emergent topological materials.
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