Chiu Chun-Chien, Chang Yao-Wen, Shao Yu-Cheng, Liu Yu-Chen, Lee Jenn-Min, Huang Shih-Wen, Yang Wanli, Guo Jinghua, de Groot Frank M F, Yang Jan-Chi, Chuang Yi-De
Department of Physics, National Cheng Kung University, Tainan, 701, Taiwan.
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
Sci Rep. 2021 Mar 4;11(1):5250. doi: 10.1038/s41598-021-84598-8.
We have successfully fabricated high quality single crystalline LaSrMnO (LSMO) film in the freestanding form that can be transferred onto silicon wafer and copper mesh support. Using soft x-ray absorption (XAS) and resonant inelastic x-ray scattering (RIXS) spectroscopy in transmission and reflection geometries, we demonstrate that the x-ray emission from Mn 3s-2p core-to-core transition (3sPFY) seen in the RIXS maps can represent the bulk-like absorption signal with minimal self-absorption effect around the Mn L-edge. Similar measurements were also performed on a reference LSMO film grown on the SrTiO substrate and the agreement between measurements substantiates the claim that the bulk electronic structures can be preserved even after the freestanding treatment process. The 3sPFY spectrum obtained from analyzing the RIXS maps offers a powerful way to probe the bulk electronic structures in thin films and heterostructures when recording the XAS spectra in the transmission mode is not available.
我们成功制备出了高质量的独立式单晶LaSrMnO（LSMO）薄膜，该薄膜可转移到硅片和铜网支架上。利用透射和反射几何构型下的软X射线吸收（XAS）和共振非弹性X射线散射（RIXS）光谱，我们证明了在RIXS图谱中看到的Mn 3s - 2p核到核跃迁（3sPFY）产生的X射线发射，能够代表在Mn L边附近具有最小自吸收效应的类体相吸收信号。我们还对生长在SrTiO衬底上的参考LSMO薄膜进行了类似测量，测量结果之间的一致性证实了即使经过独立处理过程，体相电子结构仍可得以保留这一说法。当无法在透射模式下记录XAS光谱时，通过分析RIXS图谱获得的3sPFY光谱为探测薄膜和异质结构中的体相电子结构提供了一种有力方法。
