  We have succeeded in synthesizing electron-doped polycrystalline bulk samples
of T'-La1.8Eu0.2CuO4-yFy (y = 0 - 0.15) by the fluorination of undoped
(Ce-free) T'-La1.8Eu0.2CuO4 using NH4F. The magnetic susceptibility
measurements have revealed that the superconducting transition temperature, Tc,
increases with increasing y, exhibits the maximum of 23 K at y = 0.025, and
decreases. The dome-like dependence of Tc on the doped carrier concentration in
the T'-type (La,Eu)-based cuprates is explained in terms of the pairing
mediated by spin fluctuations based on the d-p model calculation [K. Yamazaki
et al., J. Phys.: Conf. Ser. 871, 012009 (2017)].
