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Persistent exchange splitting in the chiral helimagnet $$\mathrm{Cr}_{1/3}\mathrm{NbS}_2$$

Journal Article · · Physical Review. B
 [1];  [2];  [1];  [1];  [3];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [4];  [4];  [4];  [5];  [6];  [7]
  1. Tsinghua University, Beijing (China)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  3. ShanghaiTech University (China)
  4. ShanghaiTech University (China); ShanghaiTech Laboratory for Topological Physics, Shanghai (China)
  5. Beihang University, Beijing (China); Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany)
  6. Tsinghua University, Beijing (China); ShanghaiTech University (China); ShanghaiTech Laboratory for Topological Physics, Shanghai (China); University of Oxford (United Kingdom)
  7. Tsinghua University, Beijing (China); Frontier Science Center for Quantum Information, Beijing (China)
+ Show Author Affiliations
Here, using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation, we systematically investigate the electronic structure of the chiral helimagnet Cr1/3NbS2 and its temperature evolution. The comparison with NbS2 suggests that the electronic structure of Cr1/3NbS2 is strongly modified by the intercalation of Cr atoms. Our ab initio calculation, consistent with experimental results, suggests strong hybridization between Nb- and Cr-derived states near the Fermi level. In the chiral helimagnetic state (below the Curie temperature, Tc), we observe exchange splitting of the energy bands crossing the Fermi level, which follows the temperature evolution of the magnetic moment, suggesting a strong interaction between the conduction electrons and Cr spin moments. Interestingly, the exchange splitting persists far above Tc with weak temperature dependence, in drastic contrast to the itinerant ferromagnetism described by the Stoner model, indicating the existence of short-range magnetic order. Our results provide important insights into the interplay between the electronic structure and magnetism in Cr1/3NbS2, which is helpful for understanding the microscopic mechanism of chiral helimagnetic ordering.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
Engineering and Physical Sciences Research Council (EPSRC); National Key R&D program of China; National Natural Science Foundation of China; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515
OSTI ID:
1888489
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 3 Vol. 106; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ab initio calculations
angle-resolved photoemission spectroscopy
chiral magnets
electronic structure