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Title: Interplay of itinerant electrons and Ising moments in a hybrid honeycomb quantum magnet TmNi3Al9

Journal Article · · Physical Review. B
ORCiD logo [1];  [2]; ORCiD logo [3];  [1];  [1];  [4];  [1]; ORCiD logo [5];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [6];  [1];  [4]; ORCiD logo [3]; ORCiD logo [1]; ORCiD logo [2];  [1]
  1. Southern University of Science and Technology (SUSTech), Shenzhen (China)
  2. University of Hong Kong (Hong Kong)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Southern University of Science and Technology (SUSTech), Shenzhen (China); Shenzhen Institute for Quantum Science and Engineering (China)
  5. Chinese Academy of Sciences (CAS), Ganzhou (China). Ganjiang Innovation Academy
  6. Chinese Academy of Sciences (CAS), Beijing (China); Spallation Neutron Source Science Center, Dongguan (China)

The interplay between itinerant electrons and local magnetic moments in quantum materials brings about rich and fascinating phenomena and stimulates various developments in the theoretical framework. In this work, thermodynamic, electric transport, and neutron diffraction measurements were performed on a newly synthesized honeycomb lattice magnet TmNi3Al9. Based on the experimental data, a magnetic-field–temperature phase diagram was constructed, exhibiting three essentially different magnetic regions. Below TN=2.97±0.02KTm3+, moments order antiferromagnetically in zero field. We found that the Tm3+ ions form a pseudodoublet ground state with the Ising-like moments lying normal to the two-dimensional honeycomb layers. Application of a magnetic field along the easy axis gradually suppresses the antiferromagnetic order in favor of an induced ferromagnetic state above the critical field Bc=0.92±0.05T. In the vicinity of Bc, a strong enhancement of the quantum spin fluctuations was observed. The quantum Ising nature of the local moments and the coupling to itinerant electrons are discussed.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Guangdong Basic and Applied Basic Research Foundation; National Key Research and Development Program of China; Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices; Research Grants Council of Hong Kong with General Research Fund
Grant/Contract Number:
AC05-00OR22725; 12134020; 11974157; 12174175; 12104255; 2021B1515120015; 2021YFA1400400; ZDSYS20190902092905285; KQTD20200820113047086; 2018YFE0103200; 2021YFA1400300; 2019SHZDZX04; 17306520
OSTI ID:
1885233
Journal Information:
Physical Review. B, Vol. 106, Issue 5; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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