Eu oxides on Ni(100): Polar surfaces, magic clusters and structures with large lattice dilation

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• 作者：Daniel F. Fö ; rster ; Jü ; rgen Klinkhammer ; ^{klinkhammer@ph2.uni-koeln.de} ; Thomas Michely
• 关键词：EuO ; Surface oxide ; Low energy electron diffraction (LEED) ; Scanning tunnelling microscopy (STM) ; Ni(100)
• 刊名：Surface Science
• 出版年：2012
• 出版时间：July, 2012
• 年：2012
• 卷：606
• 期：13-14
• 页码：1019-1028
• 全文大小：3374 K

文摘

Sub-monolayers of Eu oxide were grown on Ni(100) and analysed by means of in-situ scanning tunnelling microscopy and low energy electron diffraction. For changes of the O₂ pressure not more than a factor of two, four different surface phases were found which consist of EuO(111), ¡®magic?clusters and two 2-dimensional nano-layers without a counterpart in bulk Eu oxides. A structural model for one of the latter phases suggests an O-O nearest neighbour (NN) distance of 4.4 ? ?considerably larger than the 3.64 ? for bulk EuO.