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Observation of Quasi-Two-Dimensional Polar Domains and Ferroelastic Switching in a Metal, Ca3Ru2O7
Nano Letters ( IF 9.6 ) Pub Date : 2018-04-09 00:00:00 , DOI: 10.1021/acs.nanolett.8b00633 Shiming Lei , Mingqiang Gu 1 , Danilo Puggioni 1 , Greg Stone , Jin Peng 2 , Jianjian Ge 2 , Yu Wang 2 , Baoming Wang , Yakun Yuan , Ke Wang , Zhiqiang Mao 2 , James M. Rondinelli 1 , Venkatraman Gopalan
Nano Letters ( IF 9.6 ) Pub Date : 2018-04-09 00:00:00 , DOI: 10.1021/acs.nanolett.8b00633 Shiming Lei , Mingqiang Gu 1 , Danilo Puggioni 1 , Greg Stone , Jin Peng 2 , Jianjian Ge 2 , Yu Wang 2 , Baoming Wang , Yakun Yuan , Ke Wang , Zhiqiang Mao 2 , James M. Rondinelli 1 , Venkatraman Gopalan
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Polar domains arise in insulating ferroelectrics when free carriers are unable to fully screen surface-bound charges. Recently discovered binary and ternary polar metals exhibit broken inversion symmetry coexisting with free electrons that might be expected to suppress the electrostatic driving force for domain formation. Contrary to this expectation, we report the first direct observation of polar domains in single crystals of the polar metal Ca3Ru2O7. By a combination of mesoscale optical second-harmonic imaging and atomic-resolution scanning transmission electron microscopy, the polar domains are found to possess a quasi-two-dimensional slab geometry with a lateral size of ∼100 μm and thickness of ∼10 nm. Electronic structure calculations show that the coexistence of electronic and parity-lifting orders arise from anharmonic lattice interactions, which support 90° and 180° polar domains in a metal. Using in situ transmission electron microscopy, we also demonstrate a strain-tuning route to achieve ferroelastic switching of polar metal domains.
中文翻译：
Ca 3 Ru 2 O 7中准二维极性域和铁弹性转换的观察
当自由载流子无法完全屏蔽表面结合的电荷时，绝缘铁电体中就会出现极性畴。最近发现的二元和三元极性金属表现出与自由电子共存的破碎反转对称性，可以预期它会抑制形成畴的静电驱动力。与这种期望相反，我们报道了对极性金属Ca 3 Ru 2 O 7的单晶中的极性域的首次直接观察。。通过中尺度光学二次谐波成像和原子分辨率扫描透射电子显微镜的结合，发现极域具有准二维平板几何形状，其横向尺寸约为100μm，厚度约为10 nm。电子结构计算表明，电子和奇偶举序的共存源自非谐晶格相互作用，该相互作用支持金属中的90°和180°极性域。使用原位透射电子显微镜，我们还演示了一种应变调谐途径，以实现极性金属域的铁弹性转换。
更新日期：2018-04-09
中文翻译：
Ca 3 Ru 2 O 7中准二维极性域和铁弹性转换的观察
当自由载流子无法完全屏蔽表面结合的电荷时，绝缘铁电体中就会出现极性畴。最近发现的二元和三元极性金属表现出与自由电子共存的破碎反转对称性，可以预期它会抑制形成畴的静电驱动力。与这种期望相反，我们报道了对极性金属Ca 3 Ru 2 O 7的单晶中的极性域的首次直接观察。。通过中尺度光学二次谐波成像和原子分辨率扫描透射电子显微镜的结合，发现极域具有准二维平板几何形状，其横向尺寸约为100μm，厚度约为10 nm。电子结构计算表明，电子和奇偶举序的共存源自非谐晶格相互作用，该相互作用支持金属中的90°和180°极性域。使用原位透射电子显微镜，我们还演示了一种应变调谐途径，以实现极性金属域的铁弹性转换。
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