| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Structural Domain Imaging and Direct Determination of Crystallographic Orientation in Noncentrosymmetric Ca$_{3}$Ru$_{2}$O$_{7}$ Using Polarized Light Reflectance |
| Guoxiong Tang1, Libin Wen1, Hui Xing1*, Wenjie Liu1, Jin Peng2, Yu Wang2,3, Yupeng Li4, Baijiang Lv4, Yusen Yang1, Chao Yao1, Yueshen Wu1, Hong Sun1, Zhu-An Xu4, Zhiqiang Mao2,3, and Ying Liu3 |
1Key Laboratory of Artificial Structures and Quantum Control, and Shanghai Center for Complex Physics, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2Department of Physics and Engineering Physics, Tulane University, New Orleans 70118, USA
3Department of Physics, Pennsylvania State University, University Park, PA 16802, USA
4Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou 310027, China
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| Cite this article: |
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Guoxiong Tang, Libin Wen, Hui Xing et al 2020 Chin. Phys. Lett. 37 106102 |
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Abstract The noncentrosymmetricity of a prototypical correlated electron system Ca$_{3}$Ru$_{2}$O$_{7}$ renders extensive interest in the possible polar metallic state, along with multiple other closely competing interactions. However, the structural domain formation in this material often complicates the study of intrinsic material properties. It is crucial to fully characterize the structural domains for unrevealing underlying physics. Here, we report the domain imaging on Ca$_{3}$Ru$_{2}$O$_{7}$ crystal using the reflection of polarized light at normal incidence. The reflection anisotropy measurement utilizes the relative orientation between electric field component of the incident polarized light and the principal axis of the crystal, and gives rise to a peculiar contrast. The domain walls are found to be the interfaces between 90$^{\circ}$ rotated twin crystals by complementary magnetization measurements. A distinct contrast in reflectance is also found in the opposite cleavage surfaces, owing to the polar mode of the RuO$_{6}$ octahedra. More importantly, the analysis of the contrast between all inequivalent cleavage surfaces enables a direct determination of the crystallographic orientation of each domain. Such an approach provides an efficient yet feasible method for structural domain characterization, which can also find applications in noncentrosymmetric crystals in general.
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Received: 15 July 2020
Published: 29 September 2020
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| PACS: |
61.50.-f
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(Structure of bulk crystals)
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71.27.+a
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(Strongly correlated electron systems; heavy fermions)
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71.20.Gj
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(Other metals and alloys)
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78.40.Kc
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(Metals, semimetals, and alloys)
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| Fund: Supported by the National Key Research and Development Program of China (Grant Nos. 2019YFA0308602 and 2016YFA0300500), the National Natural Science Foundation of China (Grant Nos. 11804220, 11774305 and 11974237) and Natural Science Foundation of Shanghai (Grant No. 20ZR1428900). |
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