| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Quantum Oscillations in Noncentrosymmetric Weyl Semimetal SmAlSi |
| Weizheng Cao1, Yunlong Su1, Qi Wang1,2, Cuiying Pei1, Lingling Gao1, Yi Zhao1, Changhua Li1, Na Yu1, Jinghui Wang1,2*, Zhongkai Liu1,2, Yulin Chen1,2,3, Gang Li1,2*, Jun Li1,2, and Yanpeng Qi1,2,4* |
1School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
2ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China
3Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
4Shanghai Key Laboratory of High-resolution Electron Microscopy, ShanghaiTech University, Shanghai 201210, China
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| Cite this article: |
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Weizheng Cao, Yunlong Su, Qi Wang et al 2022 Chin. Phys. Lett. 39 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.
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Received: 11 November 2021
Published: 15 March 2022
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| PACS: |
75.47.-m
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(Magnetotransport phenomena; materials for magnetotransport)
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73.50.Jt
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(Galvanomagnetic and other magnetotransport effects)
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03.65.Vf
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(Phases: geometric; dynamic or topological)
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81.10.-h
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(Methods of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)
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