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Nature of Carrier Doping in T′-La<sub>1.8−</sub><i><sub>x</sub></i>Eu<sub>0.2</sub>Sr<i><sub>x</sub></i>CuO<sub>4</sub> Studied by X-Ray Photoemission and Absorption Spectroscopy
Recently, hole-doped superconducting cuprates with the T'-structure La1.8-xEu0.2SrxCuO4 (LESCO) have attracted a lot of attention. We have performed x-ray photoemission and absorption spectroscopy measurements on as-grown and reduced T0-LESCO. Results show that electrons and holes were doped by reduction annealing and Sr substitution, respectively. However, it is shown that the …