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.
@article{arxiv.2111.05235,
title = {Quantum oscillations in Noncentrosymmetric Weyl semimetals RAlSi (R = Sm and Ce)},
author = {Weizheng Cao and Qi Wang and Cuiying Pei and Lingling Gao and Yi Zhao and Changhua Li and Na Yu and Jinghui Wang and Yulin Chen and Jun Li and Yanpeng Qi},
journal= {arXiv preprint arXiv:2111.05235},
year = {2022}
}