Abstract
Abstract The high field magnetization of oxygen-depleted Ba2YCu3Oy (y=6.34) is measured up to 350 kOe using a pulse magnet to clarify the origin of the Curie-Weiss term of its magnetic susceptibility. Analysis of the high field magnetization curve reveals that the Curie-Weiss term is a result of the isolated Cu2+ (S= 1 2 ) . On the basis of experimental results, the valence states of Cu ions in the CuO chain in the Ba2YCu3Oy system are discussed.
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