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Title: Double-peak specific heat and spin freezing in the spin-2 triangular lattice antiferromagnet FeAl 2 Se 4

Journal Article · · Physical Review B
 [1];  [1];  [2];  [2];  [3];  [3];  [4];  [4];  [5];  [6];  [7];  [8];  [9]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Forschungszentrum Juelich GmbH, Garching (Germany)
  4. Helmholtz-Zentrum Dresden-Rossendorf (Germany)
  5. Fudan Univ., Shanghai (China)
  6. Fudan Univ., Shanghai (China); Nanjing Univ. (China)
  7. Boston College, Chestnut Hill, MA (United States)
  8. Fudan Univ., Shanghai (China); The Univ. of Hong Kong (China); Nanjing Univ. (China)
  9. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)

We report the properties of a triangular lattice iron-chalcogenide antiferromagnet FeAl2Se4.The spin susceptibility reveals a significant antiferromagnetic interaction with a Curie-Weiss temperature ΘCW ≃ –200 K and a spin-2 local moment. Despite a large spin and a large |ΘCW|, the low-temperature behaviors are incompatible with conventional classical magnets. No long-range order is detected down to 0.4 K. Similar to the well-known spin-1 magnet NiGa2S4, the specific heat of FeAl2Se4 exhibits a double-peak structure and a T2 power law at low temperatures, which are attributed to the underlying quadrupolar spin correlations and the Halperin-Saslow modes, respectively. The spin freezing occurs at ~14 K, below which the relaxation dynamics is probed by the ac susceptibility. Our results are consistent with the early theory for the spin-1 system with Heisenberg and biquadratic spin interactions. We argue that the early proposal of the quadrupolar correlation and gauge glass dynamics may be well extended to FeAl2Se4. Furthermore, our results provide useful insights about the magnetic properties of frustrated quantum magnets with high spins.

Research Organization:
Boston College, Chestnut Hill, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
FG02-99ER45747; 51532010; 51772323; 91422303; 51472266; 2016YFA0301001; 2016YFA0300500
OSTI ID:
1610431
Alternate ID(s):
OSTI ID: 1546326
Journal Information:
Physical Review B, Vol. 99, Issue 5; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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Cited By (1)

Neutron diffraction and short range ordering study in multiferroic Bi 2 Fe 4 O 9 journal March 2019

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