ON THE VALENCE STATE OF COPPER IN HIGH T_c SUPERCONDUCTOR YBa₂Cu₃O_x

Song Zengfu Wang Jiafu Lei Zimin Wu Jinguang Xu Guangxian(Department of Chemistry,Department of Physics,Peking University,Beijing 100871,P.R.China)

摘 要：<正> Various optical luminescence spectroscopic techniques were used to characterize the high T_csuperconductor YBa₂Cu₃O_x.The emission bands reveal that Cu³⁺ coexist with Cu²⁺ and Cu⁺ in thismaterial.

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