Shukla A K, Dhaka R S, D'Souza S W, Maniraj M, Barman S R, Horn K, Ebert Ph, Urban K, Wu D, Lograsso T A
UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore 452001, India. Institut Jean Lamour, UMR 7198 CNRS-Nancy Université-UPV Metz, Département CP2S, ENS Mines Nancy, Parc de Saurupt, CS 14234, 54042 Nancy Cedex, France.
J Phys Condens Matter. 2009 Oct 7;21(40):405005. doi: 10.1088/0953-8984/21/40/405005. Epub 2009 Sep 17.
Pseudomorphic growth of thin elemental metal films is often observed on a variety of crystalline solids. On quasicrystalline surfaces with their complex structure and the absence of translational periodicity, the situation is different since elemental metals do not exhibit quasicrystalline order, and hence the specific interaction between overlayer and substrate is decisive. Here we study the growth of manganese films on an icosahedral i-Al-Pd-Mn alloy with a view to establishing the growth mode and electronic structure. Although we observe an exponential intensity variation of the adlayer and substrate related x-ray photoemission spectroscopy (XPS) peaks, low energy electron diffraction (LEED) shows that Mn adlayers do not exhibit quasicrystallinity. The detailed structure of the Mn 2p core level line reveals considerable electronic structure differences between the quasicrystalline and elemental metal environment. Evidence of a substantial local magnetic moment on the Mn atoms in the overlayer (about 2.8 µ(B)) is obtained from the Mn 3s exchange splitting.
在各种晶体固体上经常观察到薄元素金属膜的拟晶生长。在具有复杂结构且不存在平移周期性的准晶表面上，情况有所不同，因为元素金属不呈现准晶有序，因此覆盖层与衬底之间的特定相互作用起决定性作用。在此，我们研究锰膜在二十面体i-Al-Pd-Mn合金上的生长，以确定生长模式和电子结构。尽管我们观察到与吸附层和衬底相关的X射线光电子能谱（XPS）峰的强度呈指数变化，但低能电子衍射（LEED）表明锰吸附层不呈现准晶性。Mn 2p芯能级线的详细结构揭示了准晶和元素金属环境之间存在相当大的电子结构差异。从Mn 3s交换分裂获得了覆盖层中Mn原子上存在大量局部磁矩（约2.8 μ(B)）的证据。
