准一维导体钾蓝青铜的光电子发射谱研究

准一维导体钾蓝青铜的光电子发射谱研究 PHOTOEMISSION SPECTRA STUDY OF POTTASSIUM BLUE BRONZE 石兢 1 2 3 first-author 余祖兴 1 2 3 熊锐 1 2 3 汤五丰 1 2 3 田德诚 1 2 3 吴龙仕 1 2 3 武汉大学物理学系 武汉大学物理学系 Department of Physics, Wuhan University Department of Physics, Wuhan University 湖北大学物理学系 湖北大学物理学系 武汉大学物理学系湖北大学物理学系 武汉大学物理学系湖北大学物理学系 钾蓝用青铜Ｋ０．３ＭｏＯ３的导带延拓到Ｆｅｒｍｉ能级以下约３．５ｅＶ，价带位于４～１０ｅＶ之间，除了导带与价带间的能隙不显著外，所测结果基本上符合Ｔｒａｖａｓｌｉｎｉ的模型．氧的Ｉｓ和钾的２ｐ芯能级谱中存在着弱的台阶，被理解为小能量的等离子激发．晶体结构中不等价的氧位置，导致了Ｏ－１ｓ能级谱不对称的线形式．Ｍｏ－３ｄ芯电子能谱揭示在Ｋ０．３ＭＯＯ３中存在着两种屏敝效应，以及Ｍｏ＋６，Ｍｏ＋５两种价态． X-ray and ultraviolet photoemission spectra of K0.3MoO3 are presented. The results show that the conduction band extends to 3. 5 eV below the Ef, and the valence band lies between 4 eV and 10 eV. The structures of conduction band and valence band observed by us are accord with the model of Travaglini, except ot a insignifinicant gap between conduction band and valence band. O-1s- and K-2P core lines exhibit the distinctive fearture of weak shoulders, understood as excitation of small energy plasmons. Asymmetric line shape of O-is is due to contribution from inequivalent oxygen sites. Mo-3d core lines reveal that there are two screening respances, and two valence states, e. g. Mo +6, Mo +5. 钾蓝钼青铜 光电子发射谱 电子结构 pottasium blue bronze photoemission spectrascopy electronic structure O432.12 国家自然科学基金,国家教委博士点基金 1995-05-01 2021-04-01 5