Y Fukuda, M Nagoshi, T Suzuki, Y Namba, Y Syono… - Physical Review B, 1989 - APS
X-ray photoelectron spectra of Ba 3 d and O 1 s were measured for BaO, BaC O 3, Ba (OH)
2, and Y Ba 2 Cu 3 O 7− δ in order to elucidate the chemical states of barium in Y Ba 2 Cu 3 …