X-RAY PHOTOELECTRON SPECTROSCOPY OF HIGH T_c SUPERCONDUCTOR YBa_2 Cu_3 O_(7-x)
Present address:Hengyang Institute of Technology. TIAN LU WANG Wenhao GONG Yandong SUN Yuzhen LIN Shuzi Institute of Metal Research,Academia Sinica,Shenyang,China
Acta Metallurgica Sinica (English Letters) . 1992, (8): 133 -137 .