Role of impurity oxygen in superconductivity of "non-doped" T'-(La,RE)2CuO4

A. Tsukada, M. Noda, H. Yamamoto +1

We have systematically investigated the effect of oxygen nonstoichiometry in a nominally undoped superconductor T'-(La,Y)2CuO4+y. In the experiments, the reduction condition was ch…