Cháb Vladimír, Drchal Václav, Máca František, Kudrnovský Josef, Cichoň Stanislav, Lančok Ján, Heczko Oleg
Institute of Physics, The Czech Academy of Sciences, Na Slovance 1999/2, 18221 Prague, Czech Republic.
Materials (Basel). 2022 Jan 18;15(3):717. doi: 10.3390/ma15030717.
To explain the observed features of k-space photoelectron images taken on off-stoichiometric Heusler Ni.Mn.Ga. single-crystals in the cubic austenitic and pseudotetragonal martensitic phases, the images were simulated theoretically. Despite the moderate structural difference of both phases, there is large difference in photoemission spectra. Analysis of the final states' structure, matrix elements, and interface barrier scattering was performed to interpret discrepancies between the external photoemission of the austenite and martensite. The missing signal at the surface-normal emission of the martensitic phase is, ultimately, explained by repeated scatterings of escaping electrons on the interfaces between nanotwins.
为了解释在非化学计量比的Heusler Ni.Mn.Ga.单晶的立方奥氏体相和伪四方马氏体相中拍摄的k空间光电子图像的观测特征，对这些图像进行了理论模拟。尽管这两个相的结构差异不大，但光电子能谱存在很大差异。对末态结构、矩阵元素和界面势垒散射进行了分析，以解释奥氏体和马氏体的外部光发射之间的差异。马氏体相表面法线发射处缺失的信号最终是由逸出电子在纳米孪晶间界面上的多次散射所解释的。
