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

Hongxiang Chen; Jiacheng Gao; Long Chen; Gang Wang; Hang Li; Yulong Wang; Juanjuan Liu; Jinchen Wang; Daiyu Geng; Qinghua Zhang; Jieming Sheng; Feng Ye; Tian Qian; Lan Chen; Hongming Weng; Jie Ma; Xiaolong Chen

doi:10.1002/adma.202110664

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

Hongxiang Chen, Jiacheng Gao, Long Chen, Gang Wang, Hang Li, Yulong Wang, Juanjuan Liu, Jinchen Wang, Daiyu Geng, Qinghua Zhang, Jieming Sheng, Feng Ye, Tian Qian, Lan Chen, Hongming Weng, Jie Ma, Xiaolong Chen

Single Crystal Diffraction

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

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 T_N ≈ 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. 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.

Original language	English
Article number	2110664
Journal	Advanced Materials
Volume	34
Issue number	31
DOIs	https://doi.org/10.1002/adma.202110664
State	Published - Aug 4 2022

Funding

H.X.C., J.C.G., and L.C. contributed equally to this work. H.X.C., L.C., and G.W. thank Dr. Q. S. Lin of Ames Laboratory, Dr. M. Mutailipu of Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, and Dr. S. Jia of Peking University for useful discussions. This work was partially supported by the National Natural Science Foundation of China (51832010, 51902055, 11925408, 12104255, 12188101, and 11921004), the National Key Research and Development Program of China (2018YFE0202602, 2018YFA0305700, and 2017YFA0302902), the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (QYZDJ‐SSW‐SLH013), and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB33000000). This research used resources at the Spallation Neutron Source, which are DOE Office of Science User Facilities operated by the Oak Ridge National Laboratory. H.X.C., J.C.G., and L.C. contributed equally to this work. H.X.C., L.C., and G.W. thank Dr. Q. S. Lin of Ames Laboratory, Dr. M. Mutailipu of Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, and Dr. S. Jia of Peking University for useful discussions. This work was partially supported by the National Natural Science Foundation of China (51832010, 51902055, 11925408, 12104255, 12188101, and 11921004), the National Key Research and Development Program of China (2018YFE0202602, 2018YFA0305700, and 2017YFA0302902), the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (QYZDJ-SSW-SLH013), and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB33000000). This research used resources at the Spallation Neutron Source, which are DOE Office of Science User Facilities operated by the Oak Ridge National Laboratory.

Funders	Funder number
Key Research Program of Frontier Sciences
Oak Ridge National Laboratory
National Natural Science Foundation of China	51832010, 12104255, 11925408, 11921004, 51902055, 12188101
Chinese Academy of Sciences	QYZDJ‐SSW‐SLH013, XDB33000000
National Key Research and Development Program of China	2018YFE0202602, 2018YFA0305700, 2017YFA0302902
Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences

Keywords

distortion
hourglass fermion surface state
magnetic structures
topological crystalline insulator

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10.1002/adma.202110664

Cite this

Chen, H., Gao, J., Chen, L., Wang, G., Li, H., Wang, Y., Liu, J., Wang, J., Geng, D., Zhang, Q., Sheng, J., Ye, F., Qian, T., Chen, L., Weng, H., Ma, J., & Chen, X. (2022). Topological Crystalline Insulator Candidate ErAsS with Hourglass Fermion and Magnetic-Tuned Topological Phase Transition. Advanced Materials, 34(31), Article 2110664. https://doi.org/10.1002/adma.202110664

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abstract = "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. 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.",

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

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