Abstract
Fluorescence x‐ray yield is a conventional technique which increases sensitivity of x‐ray absorption spectroscopy (XAS). Combining high brilliance x‐ray sources and state‐of‐the‐art pixel array detector (PAD) opened up unconventional application channels in condensed matter science. PAD is a segmented detector fabricated onto a mono domain single crystal by lithography. Our Ge PAD consists of 10×10 segments with almost 100% packing ratio. The local structure of photo‐induced phase transition of Fe(II) spin‐crossover complex under visible light irradiation was studied. We find that the coordination symmetry is retained upon the diamagnetic (S=0)↔paramagnetic (S=2) transformation. In the application to high‐temperature superconducting (La,Sr)2CuO4 thin film single crystals, the EXAFS results show that the local structure (CuO6 octahedron) is tetragonally deformed in accordance with the epitaxial strain. High‐quality data without the effect of substrates were obtained by real‐time monitoring segmented fluorescence signals.
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