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  • Letter
  • Open Access

Temperature-dependent and magnetism-controlled Fermi surface changes in magnetic Weyl semimetals

Nan Zhang1,*, Xianyong Ding2,*, Fangyang Zhan2, Houpu Li1, Hongyu Li1, Kaixin Tang1, Yingcai Qian1,3, Senyang Pan1,3, Xiaoliang Xiao2 et al.

Jinglei Zhang3, Rui Wang2,†, Ziji Xiang1,‡, and Xianhui Chen1,4,§

  • 1CAS Key Laboratory of Strongly Coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 2Institute for Structure and Function, Department of Physics and Center for Quantum Materials and Devices, Chongqing University, Chongqing 400044, China
  • 3High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, Anhui 230031, China
  • 4Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

  • *These authors contributed equally to this work.
  • †rcwang@cqu.edu.cn
  • ‡zijixiang@ustc.edu.cn
  • §chenxh@ustc.edu.cn
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Phys. Rev. Research 5, L022013 – Published 18 April, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L022013

Abstract

The coupling between band structure and magnetism can lead to intricate Fermi surface modifications. Here we report on the comprehensive study of the Shubnikov–de Haas (SdH) effect in two rare-earth-based magnetic Weyl semimetals, NdAlSi and CeAlSi0.8Ge0.2. The results show that the temperature evolution of topologically nontrivial Fermi surfaces strongly depends on magnetic configurations. In NdAlSi, the SdH frequencies vary with temperature in both the paramagnetic state and the magnetically ordered state with a chiral spin texture, but become temperature independent in the high-field fully polarized state. In CeAlSi0.8Ge0.2, SdH frequencies are temperature dependent only in the ferromagnetic state with magnetic fields applied along the axis. First-principles calculations suggest that the notable temperature and magnetic-configuration dependence of Fermi surface morphology can be attributed to strong exchange coupling between the conduction electrons and local magnetic moments.

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Phys. Rev. Research 5, L022013– Published 18 April, 2023
  • Received 23 September 2022
  • Revised 5 March 2023
  • Accepted 29 March 2023
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