journal article·2019-10-22

Magnetism and Optical Anisotropy in van der Waals Antiferromagnetic Insulator CrOCl

Tianle Zhang, Yimeng Wang, Hexuan Li, Fang Zhong, Jia Shi, Minghui Wu, Zhaoyang Sun, Wanfu Shen, Bin Wei, Weida Hu, Xinfeng Liu, Li Huang, Chunguang Hu, Zhongchang Wang, Chengbao Jiang, Shengxue Yang, Qing-ming Zhang, Zhe Qu

ACS Nano· Volume 13· Issue 10
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Abstract

van der Waals (vdW) magnetic insulators are of significance in both fundamental research and technological application, but most two-dimensional (2D) vdW magnetic systems are unstable and of high lattice symmetry. Stable 2D vdW magnetic insulators with anisotropic structure are needed to modulate the properties and unlock potential applications. Here we present a stable vdW antiferromagnetic material, CrOCl, with low-symmetry orthorhombic structure, and investigate systematically its magnetism, phase transition behavior, and optical anisotropy. Spin–phonon coupling effects are uncovered by the abnormal frequency shifts of Raman-active modes, suggesting the formation of a magnetic superstructure. The sizable abnormal change of interplanar spacing indicates the presence of a structural transition at around 27 K. Further in-plane vibrational, reflectional, and absorptional anisotropic properties are explored both experimentally and theoretically, revealing a highly polarization sensitive characteristic and linear dichroism in 2D CrOCl. Meanwhile, the particularly high polarization dependency of the second-harmonic generation and the nonlinear susceptibility of ∼2.24 × 10–11 m/V make it suitable in the field of polarization-dependent nonlinear optics. The findings on the intricate properties of 2D CrOCl lay foundations for future applications of low-symmetry vdW magnets in spin-dependent electronic and optoelectronic devices.
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Research context

OpenAlex topics: 2D Materials and Applications · ZnO doping and properties · Perovskite Materials and Applications

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Affiliations

School of Materials Science and Engineering, Beihang University, Beijing 100191, China

Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China

Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, Anhui 230031, China

University of Science and Technology of China, Hefei, Anhui 230026, China

State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China

University of Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, China

Department of Physics, Southern University of Science and Technology, Shenzhen 518005, China

State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Weijin Road, CN-300072 Tianjin, China

Department of Quantum and Energy Materials, International Iberian Nanotechnology Laboratory (INL), Avenida Mestre José Veiga s/n, Braga 4715-330, Portugal

National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China

Funding

Ministry of Science and Technology of the People's Republic of China · Hefei Center for Physical Science and Technology · National Natural Science Foundation of China

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