Electronic states of high-T_c cuprate in the anomalous metallic regime

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• 作者：Matsueda ; Hiroaki ; Takanaka ; Kenji
• 关键词：High-T_c cuprate ; Equation of motion method ; Composite operator ; Intersite spin correlation
• 刊名：Physica C
• 出版年：2003
• 期刊代码：80_09214534
• 类别：ms
• 出版时间：May, 2003
• 卷：388-389
• 期：Complete
• 页码：33-34
• 文件大小：78.8 K

摘要

By use of the d–p model for cuprate, we investigate the density of states. One of the advantages in our method is to use the retarded propagator matrix which is defined by several composite particles, for example, pure fermion, dressed fermion with local spin fluctuation, and one with global fluctuation between nearest neighbour Cu sites. The shapes of the density of states rapidly change by doping and temperature because the propagator includes new poles and some mean fields which easily change by those external parameters. The competition between the composite states with spin fluctuation may originate from the spin gap formation observed in high-T_c cuprate.