CNR-IOM TASC National Laboratory, Area Science Park-Basovizza, 34149 Trieste, Italy.
Adv Mater. 2013 Aug 7;25(29):4043-8. doi: 10.1002/adma.201301841. Epub 2013 Jun 28.
Atomic engineering of perovskite films and interfaces is significantly improved by in situ optimization of reflection high-energy electron diffraction (RHEED) features resulting from surface BO₆ octahedral rotations seen during molecular-beam epitaxy growth. This approach yields Sr-doped manganite films across the phase diagram with magnetotransport properties that are, for the first time, identical to bulk single crystals. Careful structural analysis of manganite/titanate interfaces shows that cation intermixing and unit cell dilations are eliminated, while BO₆ rotations and Jahn-Teller-type elongations are nearly completely suppressed at the interface.
通过在分子束外延生长过程中观察到的表面 BO₆ 八面体旋转，对反射高能电子衍射 (RHEED) 特征进行原位优化，可显著改善钙钛矿薄膜和界面的原子工程。这种方法可在整个相图中生成 Sr 掺杂锰酸盐薄膜，其磁输运性质与体单晶首次相同。对锰酸盐/钛酸盐界面的仔细结构分析表明，阳离子混合和单元晶格膨胀被消除，而 BO₆ 旋转和 Jahn-Teller 型伸长在界面处几乎完全被抑制。
