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We performed neutron powder diffraction measurements on the as-sintered (AS)and oxygen-reduced (OR) La$_{1.8}$Eu$_{0.2}$CuO$_{4+\alpha-\delta}$ (LECO). Thestructural parameters for oxygens in AS and OR samples refined by the Rietveldanalysis are almost identical to those of the reference system,Pr$_{2}$CuO$_{4+\alpha-\delta}$. Thus, the two systems are comparable in termsof the structural changes in oxygens due to the annealing, althoughsuperconductivity appears only in LECO.

Reduction annealing effects on the crystal structure of $T^{\prime}$-type La$_{1.8}$Eu$_{0.2}$CuO$_{4+\alpha-\delta}$