Charge and orbital degrees of freedom at interfaces studied with nonlinear optics

用非线性光学研究界面处的电荷和轨道自由度

• 批准号: 21740243
• 负责人: OGAWA Naoki
• 金额: $ 2.91万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740243/
• 关键词: 強相関系; 非線形光学; 強相関電子系; 軌道秩序; 薄膜

Large magneto-resistance and strain-induced symmetry breaking were fond in the epitaxial thin films and their interfaces of perovskite manganites. By composing a phase diagram by using magneto-transports and nonlinear optics, the critical thickness of the d(x^2-y^2)-type orbital-order was confirmed to be about 4 nm. Under a second-harmonic microscope, the evolution of orbital-ordered domains was studied in detail, and these domains could be manipulated by photoirradiation.

钙钛矿型锰氧化物外延薄膜及其界面具有较大的磁阻和应变诱导对称性破缺。通过磁输运和非线性光学组成的相图，确定d(x^2-y^2)型轨道序的临界厚度约为4 nm。在二次谐波显微镜下，详细研究了轨道有序结构域的演化，这些结构域可以通过光照射进行操控。