Quantum Oscillations in Noncentrosymmetric Weyl Semimetal SmAlSi

doi:10.1088/0256-307X/39/4/047501

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Abstract：As a new type of quantum state of matter hosting low energy relativistic quasiparticles, Weyl semimetals (WSMs) have attracted significant attention for scientific community and potential quantum device applications. In this study, we present a comprehensive investigation of the structural, magnetic, and transport properties of noncentrosymmetric $R$AlSi ($R$ = Sm, Ce), which have been predicted to be new magnetic WSM candidates. Both samples exhibit nonsaturated magnetoresistance, with about 900% and 80% for SmAlSi and CeAlSi, respectively, at temperature of 1.8 K and magnetic field of 9 T. The carrier densities of SmAlSi and CeAlSi exhibit remarkable change around magnetic transition temperatures, signifying that the electronic states are sensitive to the magnetic ordering of rare-earth elements. At low temperatures, SmAlSi reveals prominent Shubnikov–de Haas oscillations associated with the nontrivial Berry phase. High-pressure experiments demonstrate that the magnetic order is robust and survival under high pressure. Our results would yield valuable insights into WSM physics and potentials in applications to next-generation spintronic devices in the $R$AlSi ($R$ = Sm, Ce) family.

收稿日期: 2021-11-11 出版日期: 2022-03-15

:	75.47.-m	(Magnetotransport phenomena; materials for magnetotransport)
	73.50.Jt	(Galvanomagnetic and other magnetotransport effects)
	03.65.Vf	(Phases: geometric; dynamic or topological)
	81.10.-h	(Methods of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)

引用本文:

. [J]. 中国物理快报, 2022, 39(4): 47501-.
Weizheng Cao, Yunlong Su, Qi Wang, Cuiying Pei, Lingling Gao, Yi Zhao, Changhua Li, Na Yu, Jinghui Wang, Zhongkai Liu, Yulin Chen, Gang Li, Jun Li, and Yanpeng Qi. Quantum Oscillations in Noncentrosymmetric Weyl Semimetal SmAlSi. Chin. Phys. Lett., 2022, 39(4): 47501-.

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https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/39/4/047501 或 https://cpl.iphy.ac.cn/CN/Y2022/V39/I4/47501

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