Depth resolved electronic structure of cuprate superconductor analyzed by two-dimensional X-ray Auger resonance emission spectroscopy

Chikako Sakai; Fumihiko Matsui; Tomohiro Matsushita; Yukako Kato; Takashi Narikawa; Hiroshi Daimon

doi:10.1380/ejssnt.2007.143

Regular Papers

Depth resolved electronic structure of cuprate superconductor analyzed by two-dimensional X-ray Auger resonance emission spectroscopy

Chikako Sakai, Fumihiko Matsui, Tomohiro Matsushita, Yukako Kato, Takashi Narikawa, Hiroshi Daimon

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Keywords: Auger emission angular distribution, Conduction state, Copper oxides, Superconductivity, Surface structure, X-ray absorption spectroscopy

JOURNAL FREE ACCESS

2007 Volume 5 Pages 143-147

DOI https://doi.org/10.1380/ejssnt.2007.143

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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 3d_x^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 3d_x^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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