Crystallographic Domain Structure of an Epitaxial (Pr0.7Ca0.3)MnO3 Thin Film Grown on a SrTiO3 Single Crystal Substrate
Crystallographic Domain Structure of an Epitaxial (Pr0.7Ca0.3)MnO3 Thin Film Grown on a SrTiO3 Single Crystal Substrate
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DOI：
10.1111/j.1551-2916.2007.01686.x
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发表时间：
2007-07
影响因子：
3.9
通讯作者：
M. Fujimoto;H. Koyama;Y. Nishi;Toshimasa Suzuki;Shinji Kobayashi;Y. Tamai;N. Awaya
中科院分区：
文献类型：
--
作者：
M. Fujimoto;H. Koyama;Y. Nishi;Toshimasa Suzuki;Shinji Kobayashi;Y. Tamai;N. Awaya
本文研究了在（001）SrTiO_3（STO）单晶衬底上外延生长的（Pr_（0.7）Ca_（0.3））MnO_3（PCMO（x=0.3））薄膜的晶畴结构。我们发现，域结构与STO衬底呈现出原子级光滑的共格界面，没有失配位错。晶畴和衬底在其平面内的晶体学关系被解释为PCMO（x=0.3）[1 - 10][001]//STO[100][010]和PCMO（x=0.3）[001][1-10]//STO[100][010]。PCMO（x=0.3）[1-10][1-10]//STO[100][010]的畴结构具有在PCMO（x=0.3）的单斜畸变伪立方钙钛矿晶胞中发现的较大各向异性应变能的可能性较小。这种外延生长结构与以前报道的在STO衬底上的PCMO（x=0.5）外延薄膜结构完全不同。我们的观察表明，x值的变化强烈影响外延PCMO薄膜的结构。
We characterized the structure of the crystallographic domain of a (Pr0.7Ca0.3)MnO3 (PCMO (x=0.3)) thin film epitaxially grown on a (001)SrTiO3 (STO) single-crystal substrate. We found that the domain structure exhibited an atomically smooth coherent interface with the STO substrate with no misfit dislocations. The crystallographic relationships between the domains and the substrate in their planes were interpreted to be PCMO (x=0.3)[110][001]//STO[100][010] and PCMO (x=0.3)[001][1-10]//STO[100][010]. The domain structure of PCMO (x=0.3)[110][1-10]//STO[100][010] has less possibility of having the larger anisotropic strain energy found in a monoclinically distorted pseudo-cubic perovskite unit cell of PCMO (x=0.3). This epitaxial growth structure is totally different from the previously reported PCMO (x=0.5) epitaxial thin-film structure on STO substrate. Our observations suggested that an x value change strongly influences the structure of epitaxial PCMO thin films.