Abstract
Based on the measurements of emission angle and photon energy dependences of Auger electron intensity by using a display-type analyzer, two-dimensional X-ray Auger resonance emission spectroscopy (2D-XARES) method for depth resolved analysis of atomic and electronic structures has been developed. Here we applied this method to analyze the hole distribution at the surface region of high-transition-temperature cuprate superconductor (Bi2212). The crystalline quality at each point on the sample surface was evaluated by Cu LMM Auger emission angular distribution (AEAD). Cu L-edge X-ray absorption spectra, especially the resonance peak structure of Cu 3dx^2-y^2 at absorption edge were shown to be quite sensitive to the surface quality. By combining AEAD with XANES, i.e. 2D-XARES, the vertical distribution of Cu 3dx^2-y^2 hole state at the surface region in conjunction with crystalline quality was revealed. [DOI: 10.1380/ejssnt.2007.143]
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