The dispersion of a hole in a two-dimensional Cu3O4 plane: a tale of two singlets
The dispersion of a hole in a two-dimensional Cu3O4 plane: a tale of two singlets
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二维 Cu3O4 平面中空穴的色散：两个单态的故事
DOI：
10.1103/physrevlett.78.4107
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
R. Hayn
中科院分区：
文献类型：
--
作者：
Golden;H. Schmelz;M. Knupfer;S. Haffner;G. Krabbes;J. Fink;V. Yushankhai;H. Rosner;R. Hayn
Ba{sub 2}Cu {sub 3}O{sub 4}Cl{sub 2} 的偏振相关角分辨光电子能谱测量表明，在这种绝缘氯氧化铜的二维 Cu{sub 3}O{sub 4} 平面中存在两种不同的张-莱斯单峰。借助模型计算，我们表明一个单线态在反铁磁有序的铜酸盐类 Cu{sub A}O {sub 2} 子系统中移动，另一个单线态在由额外的 Cu{sub B} 原子形成的有效顺磁亚晶格上移动。因此，前者的色散由超交换积分 J{sub A} 确定，后者的色散由跳频积分 t{sub B} 确定。因此，就磁背景的作用而言，该系统中单个孔的色散关系同时代表了单个结构中铜酸盐平面的低掺杂极限和极高掺杂极限。 {版权} {ital 1997} {ital 美国物理学会}
Polarization-dependent angle-resolved photoemission spectroscopy measurements of Ba{sub 2}Cu {sub 3}O{sub 4}Cl{sub 2} indicate the presence of two different Zhang-Rice singlets in the two-dimensional Cu{sub 3}O{sub 4} plane of this insulating copper oxychloride. With the aid of model calculations, we show that one singlet is moving in the antiferromagnetically ordered cupratelike Cu{sub A}O {sub 2} subsystem and the other on the effectively paramagnetic sublattice formed by the extra Cu{sub B} atoms. The dispersion of the former is thus determined by the superexchange integral J{sub A} , and that of the latter by the hopping integral t{sub B} . Consequently, as far as the role of the magnetic background is concerned, the dispersion relation of a single hole in this system represents simultaneously both the low and very high doping limits of a cuprate plane in a single structure. {copyright} {ital 1997} {ital The American Physical Society}