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Topological Crystalline Insulator Candidate ErAsS with Hourglass Fermion and Magnetic-Tuned Topological Phase Transition

Journal Article · · Advanced Materials
 [1];  [2];  [2];  [3];  [4];  [2];  [5];  [5];  [2];  [6];  [7];  [8];  [3];  [3];  [3];  [9];  [3]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Fujian University of Technology, Fuzhou (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)
  3. Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Laboratory, Guangdong (China)
  4. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  5. Renmin Univ. of China, Beijing (China)
  6. Chinese Academy of Sciences (CAS), Beijing (China)
  7. Southern University of Science and Technology (SUSTech), Shenzhen (China)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  9. Shanghai Jiao Tong Univ. (China)

Topological crystalline insulators (TCIs) with hourglass fermion surface state have attracted a lot of attention and are further enriched by crystalline symmetries and magnetic order. Here, the emergence of hourglass fermion surface state and exotic phases in the newly discovered, air-stable ErAsS single crystals are shown. In the paramagnetic phase, ErAsS is expected to be a TCI with hourglass fermion surface state protected by the nonsymmorphic symmetry. Dirac-cone-like bands and nearly linear dispersions in large energy range are experimentally observed, consistent well with theoretical calculations. Below TN ≈ 3.27 K, ErAsS enters a collinear antiferromagnetic state, which is a trivial insulator breaking the time-reversal symmetry. An intermediate incommensurate magnetic state appears in a narrow temperature range (3.27–3.65 K), exhibiting an abrupt change in magnetic coupling. Overall, the results reveal that ErAsS is an experimentally available TCI candidate and provide a unique platform to understand the formation of hourglass fermion surface state and explore magnetic-tuned topological phase transitions.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC); National Key Research and Development Program of China; Chinese Academy of Sciences (CAS)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1892379
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 31 Vol. 34; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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