标题： BaTiO3电子态在交流电场下的介电响应通过微秒时间分辨X射线吸收光谱研究 显示英文标题

标题： Dielectric response of BaTiO3 electronic states under AC fields via microsecond time-resolved X-ray absorption spectroscopy

摘要： 首次利用时间分辨X射线吸收谱在Ti K边对BaTiO3薄膜在交流电场下的介电响应进行研究，以明确每个组成原子对电子态的关联贡献。 预边eg峰和主边下方的肩峰强度随着施加电场幅度的增加而增加，而主峰强度则以相反的方式减少。 基于多重散射理论，针对不同的Ti偏离中心位移模拟了eg峰和主峰的增加和减少。 我们的结果表明，这些光谱特征分别反映了Ti 3d与O 2p以及Ti 4p的原子间和原子内杂化。 相反，肩峰结构不受Ti偏离中心位移变化的影响，但容易受到角位点Ba离子的影响。 这是对Ba动态电子贡献在极化翻转中首次实验验证。 显示英文摘要

摘要： For the first time, the dielectric response of a BaTiO3 thin film under an AC electric field is investigated using time-resolved X-ray absorption spectroscopy at the Ti K-edge to clarify correlated contributions of each constituent atom on the electronic states. Intensities of the pre-edge eg peak and shoulder structure just below the main edge increase with an increase in the amplitude of the applied electric field, whereas that of the main peak decreases in an opposite manner. Based on the multiple scattering theory, the increase and decrease of the eg and main peaks are simulated for different Ti off-center displacements. Our results indicate that these spectral features reflect the inter- and intra-atomic hybridization of Ti 3d with O 2p and Ti 4p, respectively. In contrast, the shoulder structure is not affected by changes in the Ti off-center displacement but is susceptible to the effect of the corner site Ba ions. This is the first experimental verification of the dynamic electronic contribution of Ba to polarization reversal.