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Quasiparticle characteristics of the weakly ferromagnetic Hund metal MnSi

Journal Article · · Physical Review. B
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [1];  [5];  [1];  [6]
  1. Zhejiang University, Hangzhou (China)
  2. Chinese Academy of Sciences (CAS), Shanghai (China)
  3. Chinese Academy of Sciences (CAS), Beijing (China)
  4. Argonne National Laboratory (ANL), Argonne, IL (United States)
  5. University of Science and Technology China, Hefei
  6. Zhejiang University, Hangzhou (China); Nanjing University (China)
+ Show Author Affiliations
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. Here, 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
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Central Universities; Fundamental Research Funds for the Central Universities; Key R&D Program of Zhejiang Province, China; National Science Foundation (NSF); National Science Foundation of China; Shanghai Synchrotron Radiation Facility (SSRF); State Key Project of Zhejiang Province; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1909025
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 16 Vol. 106; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Kondo effect
angle-resolved photoemission spectroscopy
ferromagnets
magnetic order
molecular beam epitaxy
strongly correlated systems