Angle-resolved photoemission study of insulating and metallic Cu-O chains in PrBa2Cu3O7 and PrBa2Cu4O8
Angle-resolved photoemission study of insulating and metallic Cu-O chains in PrBa2Cu3O7 and PrBa2Cu4O8
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DOI：
10.1103/physrevlett.85.4779
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发表时间：
2000-11
影响因子：
8.6
通讯作者：
T. Mizokawa;Changyoung Kim;Z. Shen;A. Ino;T. Yoshida;A. Fujimori;M. Goto;H. Eisaki;H. Eisaki;S. Uchida;M. Tagami;K. Yoshida;A. Rykov;Y. Siohara;K. Tomimoto;Setsuko Tajima;Y. Yamada;Shigeru Horii;N. Yamada;Y. Yamada;I. Hirabayashi
中科院分区：
文献类型：
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作者：
T. Mizokawa;Changyoung Kim;Z. Shen;A. Ino;T. Yoshida;A. Fujimori;M. Goto;H. Eisaki;H. Eisaki;S. Uchida;M. Tagami;K. Yoshida;A. Rykov;Y. Siohara;K. Tomimoto;Setsuko Tajima;Y. Yamada;Shigeru Horii;N. Yamada;Y. Yamada;I. Hirabayashi
我们比较了PrBa_2Cu_3O_7（Pr 123）和PrBa_2Cu_4O_8（Pr 124）中空穴掺杂的Cu-O链的角分辨光电子能谱。而在Pr 123中，来自链的色散特征在约π/4的k（B）（沿着链的动量）处获得带最大值，并在费米能级附近失去其光谱权重，而在Pr 124中，它在约π/4的k（B）处达到费米能级。虽然Pr 123和Pr 124中的链被填充了大约1/4，但它们表现出相反的行为：虽然Pr 123中的链对电荷有序有不稳定性，但Pr 124中的链避免了它，并显示出金属耦合链系统的有趣光谱特征。
We compare the angle-resolved photoemission spectra of the hole-doped Cu-O chains in PrBa2Cu3O7 (Pr123) and in PrBa2Cu4O8 (Pr124). While, in Pr123, a dispersive feature from the chain takes a band maximum at k(b) (momentum along the chain) approximately pi/4 and loses its spectral weight around the Fermi level, it reaches the Fermi level at k(b) approximately pi/4 in Pr124. Although the chains in Pr123 and Pr124 are approximately 1/4 filled, they show contrasting behaviors: While the chains in Pr123 have an instability to charge ordering, those in Pr124 avoid it and show an interesting spectral feature of a metallic coupled-chain system.