X射线衍射技术分析发现,通过生长一层较厚的LaAlO3顶层结构,可以把LaAlO3-BaTiO3超晶格中界面处的应变有效地控制在薄膜中,从而增加超晶格薄膜的平均面外晶格常数c.电学性能测试证明LaAlO3顶层结构的存在极大地改善了超晶格薄膜的电学性能,使其剩余极化强度增加了40多倍.
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