Structural Domain Imaging and Direct Determination of Crystallographic Orientation in Noncentrosymmetric Ca3 Ru2O7 Using Polarized Light Reflectance  

作　　者：Guoxiong Tang Libin Wen Hui Xing Wenjie Liu Jin Peng Yu Wang Yupeng Li Baijiang Lv Yusen Yang Chao Yao Yueshen Wu Hong Sun Zhu-An Xu Zhiqiang Mao Ying Liu 唐国雄;文理斌;邢晖;刘文杰;彭劲;王瑜;李宇鹏;吕柏江;杨宇森;姚超;吴越珅;孙弘;许祝安;毛志强;刘荧(Key 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;Department of Physics and Engineering Physics,Tulane University,New Orleans 70118,USA;Department of Physics,Pennsylvania State University,University Park,PA 16802,USA;Zhejiang Province Key Laboratory of Quantum Technology and Device,Department of Physics,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]Key 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 [2]Department of Physics and Engineering Physics,Tulane University,New Orleans 70118,USA [3]Department of Physics,Pennsylvania State University,University Park,PA 16802,USA [4]Zhejiang Province Key Laboratory of Quantum Technology and Device,Department of Physics,Zhejiang University,Hangzhou 310027,China

出　　处：《Chinese Physics Letters》2020年第10期43-47,共5页中国物理快报（英文版）

基　　金：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);Natural Science Foundation of Shanghai(Grant No.20ZR1428900).

摘　　要：The noncentrosymmetricity of a prototypical correlated electron system Ca3Ru2O7 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 Ca3Ru2O7 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° 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 RuO6 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.

关 键 词：SYMMETRIC CLEAVAGE utilize 

分 类 号：O76[理学—晶体学] O436.3[机械工程—光学工程]