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  • Letter

Quasiparticle characteristics of the weakly ferromagnetic Hund metal MnSi

Yuan Fang1,*, Huali Zhang1,*, Ding Wang1,*, Guowei Yang1, Yi Wu1, Peng Li1, Zhiguang Xiao1, Tianyun Lin1, Hao Zheng1 et al.

Xiao-Long Li2, Huan-Hua Wang3, Fanny Rodolakis4, Yu Song1, Yilin Wang5, Chao Cao1, and Yang Liu1,6,7,†

  • 1Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China
  • 2Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
  • 3Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 4Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
  • 5Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 6Zhejiang Province Key Laboratory of Quantum Technology and Device, Zhejiang University, Hangzhou, China
  • 7Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

  • *These authors contributed equally to this work.
  • †yangliuphys@zju.edu.cn
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Phys. Rev. B 106, L161112 – Published 25 October, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L161112

Abstract

Hund metals are multiorbital systems with 3d or 4d electrons exhibiting both an itinerant character and local moments, and they feature Kondo-like screenings of local orbital and spin moments, with suppressed coherence temperatures driven by Hund's coupling JH. They often exhibit magnetic order at low temperature, but how the interaction between the Kondo-like screening and long-range magnetic order is manifested in the quasiparticle spectrum remains an open question. Here, we present the spectroscopic signature of such an interaction in a Hund metal candidate MnSi exhibiting weak ferromagnetism. Our photoemission measurements reveal renormalized quasiparticle bands near the Fermi level with strong momentum dependence: The ferromagnetism manifests through possibly exchange-split bands (Q1) below TC, while the spin/orbital screenings lead to the gradual development of quasiparticles (Q2) upon cooling. Our results demonstrate how the characteristic spin/orbital coherence in a Hund metal could coexist and compete with the magnetic order to form a weak itinerant ferromagnet, via quasiparticle bands that are well separated in momentum space and exhibit distinct temperature dependence. Our results imply that the competition between the spin/orbital screening and the magnetic order in a Hund metal bears interesting similarities to the Kondo lattice systems.

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Phys. Rev. B 106, L161112– Published 25 October, 2022
  • Received 20 June 2022
  • Revised 26 September 2022
  • Accepted 12 October 2022
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