Observation of Quantum Oscillations in CaAs3
Author Information
Author(s): Wang Yuxiang, Zhao Minhao, Zhang Jinglei, Wu Wenbin, Li Shichao, Zhang Yong, Jiang Wenxiang, Joseph Nesta Benno, Xu Liangcai, Mou Yicheng, Yang Yunkun, Leng Pengliang, Zhang Yong, Pi Li, Suslov Alexey, Ozerov Mykhaylo, Wyzula Jan, Orlita Milan, Zhu Fengfeng, Zhang Yi, Kou Xufeng, Zhu Zengwei, Narayan Awadhesh, Qian Dong, Wen Jinsheng, Yuan Xiang, Xiu Faxian, Zhang Cheng
Primary Institution: Fudan University
Hypothesis
Can quantum oscillations be observed near the Mott-Ioffe-Regel limit in CaAs3?
Conclusion
The study found that CaAs3 exhibits quantum oscillations and quasiparticle mass enhancement near the Mott-Ioffe-Regel limit, indicating highly coherent band transport despite an insulator-like resistivity.
Supporting Evidence
- CaAs3 shows giant magnetoresistance and prominent Shubnikov–de Haas oscillations.
- The quasiparticle effective mass increases systematically with magnetic fields.
- Quantum oscillations are absent in the magnetic torque measurements.
- These behaviors suggest a strong many-body renormalization effect near the Fermi surface.
- The study highlights the interplay between the mobility edge and the van Hove singularity.
Takeaway
Scientists studied a material called CaAs3 and found that it can show special patterns called quantum oscillations, even when it behaves like an insulator at certain temperatures.
Methodology
The researchers performed magneto-transport experiments on CaAs3 bulk crystals using variable temperature inserts with superconducting and resistive magnets.
Limitations
The study did not explore the effects of different sample conditions on the observed phenomena.
Digital Object Identifier (DOI)
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