论文标题
A位置有序的钙钛矿CACU3TI4-XRUXO12中强相关效应的变化：光发射和逆光发射研究
Variation of strong correlation effects in A-site ordered perovskites CaCu3Ti4-xRuxO12: Photoemission and inverse photoemission studies
论文作者
论文摘要
我们通过使用光发射和逆光发射光谱法中系统地研究了A个点有序的钙蛋白孔CACU3TI4-XRUXO12（x = 0、1、3.5和4）中的强相关效应。在x = 0、1、3.5中，密切相关的cu 3D状态的峰位置在-3.8 eV和ti 3D状态左右3.6 eV左右。另一方面，在x = 4中，Cu 3D状态分为-2.5和-4 eV左右。这些表明TI在保留强相关效应方面起着重要作用。此外，随着RU的增加，Cu 3D最终状态的多重结构从-8到-14 eV变得薄弱，表明Cu 3D状态的局部特征的降低。在费米水平上，我们观察到x = 0、1中没有光谱重量，而x = 3.5、4中ru 4d内间隙状态的发展产生了x = 1和x = 3.5之间的金属绝缘体过渡。
We have systematically studied the strong correlation effects in A-site ordered perovskites CaCu3Ti4-xRuxO12 (x = 0, 1, 3.5, and 4) by using photoemission and inverse photoemission spectroscopies. In x = 0, 1, 3.5, the peak positions of the strongly correlated Cu 3d states around -3.8 eV and Ti 3d states around 3.6 eV little change. On the other hand, in x = 4, the Cu 3d states split into two peaks around -2.5 and -4 eV. These indicate that Ti plays an important role to retain the strong correlation effects. In addition, the multiplet structures of Cu 3d final states from -8 to -14 eV become weak as Ru increases, indicating the reduction of the localized characters of Cu 3d states. At the Fermi level, we observe the absence of spectral weight in x = 0, 1 and the development of Ru 4d in-gap states in x = 3.5, 4, which give rise to the metal-insulator transition between x = 1 and x = 3.5.
