Quantum oscillations in Noncentrosymmetric Weyl semimetals RAlSi (R = Sm and Ce)

Abstract

Weyl semimetal (WSM) as a new type of quantum state of matter hosting low energy relativistic quasiparticles, has attracted significant attention for both scientific community and potential quantum device applications. Here, we report a comprehensive investigation of the structural, magnetic and transport properties of noncentrosymmetric RAlSi (R = Sm, Ce), which have been predicted to be new magnetic WSM candidates. Both samples exhibit non-saturated magnetoresistance (MR), with ~ 900% for SmAlSi and 80% for CeAlSi at 1.8 K, 9 T. The carrier densities of SmAlSi and CeAlSi display remarkable change around magnetic transition temperatures, signifying that the electronic states are sensitive to magnetic ordering of rare earth elements. At low temperatures, SmAlSi reveals prominent Shubnikov-de Haas (SdH) 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 of WSM physics and potentials in application to the next-generation spintronic devices in RAX family.

arXiv comment15 pages, 5 figures

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Cited by in corpus (13)

• Ferrimagnetic Regulation of Weyl Fermions in a Noncentrosymmetric Magnetic Weyl Semimetal
• Sign change of the anomalous Hall effect and the anomalous Nernst effect in Weyl semimetal CeAlSi
• Kramers nodal lines and Weyl fermions in SmAlSi
• Multi-k magnetic structure and large anomalous Hall effect in candidate magnetic Weyl semimetal NdAlGe
• Signature of weakly coupled $f$ electrons and conduction electrons in magnetic Weyl semimetal candidates PrAlSi and SmAlSi
• Magnetic, thermodynamic, and magnetotransport properties of CeGaGe and PrGaGe single crystals
• Optical signatures of type-II Weyl fermions in the noncentrosymmetric semimetals $R$AlSi ($R$=La, Ce, Pr, Nd, Sm)
• Pressure-induced Superconductivity in Zintl Topological Insulator SrIn2As2
• Gate-tunable Lifshitz transition of Fermi arcs and its nonlocal transport signatures
• Structural characterization of the candidate Weyl semimetal CeGaGe
• Single crystalline orthorhombic GdAlGe as a rare earth magnetic Dirac nodal-line metal
• Anomalous Hall effect in the antiferromagnetic Weyl semimetal SmAlSi
• Is it possible to determine unambiguously the Berry phase solely from quantum oscillations?