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arXiv 0811.0552cond-mat.str-elcond-mat.supr-con
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高温铜氧化物超导体的两粒子激发理论和磁化率

Theory of two-particle excitations and the magnetic susceptibility in high-Tc cuprate superconductors

S. Brehm, E. Arrigoni, M. Aichhorn, W. Hanke

摘要:

双粒子(2-p)激发,如自旋和电荷激发在高温超导体(HTSC)中起着关键作用。无参数理论的基础上,它扩展了变分聚类方法(最近开发的嵌入式集群方法)的2-p激发,HTSC的磁激发的再现哈伯德模型在相关的强耦合制度。特别是,在欠掺杂制度的共振模式,其强度和“沙漏”的色散是在良好的整体协议与实验。

英文摘要:

Two-particle (2-p) excitations such as spin and charge excitations play a key role in high-Tc cuprate superconductors (HTSC). On the basis of a parameter-free theory, which extends the Variational Cluster Approach (a recently developed embedded cluster method) to 2-p excitations, the magnetic excitations of HTSC are shown to be reproduced for a Hubbard model within the relevant strong-coupling regime. In particular, the resonance mode in the underdoped regime, its intensity and "hour-glass" dispersion are in good overall agreement with experiments.

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