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arXiv 1203.4652cond-mat.supr-con
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对铜氧化物高$T_c$超导体d波配对机制的评论:高是不同的?

Comments on the d-wave pairing mechanism for cuprate high $T_c$ superconductors: Higher is different?

Han-Yong Choi

摘要:

本文重新讨论了铜氧化物超导体(SC)的配对胶问题,并详细讨论了角分辨光电子能谱(ARPES)测定配对胶的方法。关于配对胶的问题有两个学派:一个学派认为铜酸盐的超导性来自于掺杂自旋单重共振价键(RVB)态。由于单重态对已经在RVB态中形成,因此不需要额外的玻色子胶来配对电子。另一个则认为d波对是由集体玻色子介导的,就像传统的低$T_c$ SC一样,只是声子被另一种玻色子所取代,从反铁磁(AF)到回路电流波动。解决这一争议的一种方法是直接从常规SC的McMillan-Rowell方法等实验中确定对角和非对角自能的频率和动量依赖性。在简单的d波BCS理论很好地描述了铜氧化物的超导性质的情况下,对精心设计的高分辨率实验数据的Eliashberg分析将产生自能的关键频率和动量依赖性。这条线的方法,使用ARPES更详细地讨论在这次审查中,和一些剩余的问题进行了评论。

英文摘要:

The question of pairing glue for the cuprate superconductors (SC)is revisited and its determination through the angle resolved photo-emission spectroscopy (ARPES) is discussed in detail. There are two schools of thoughts about the pairing glue question: One argues that superconductivity in the cuprates emerges out of doping the spin singlet resonating valence bond (RVB) state. Since singlet pairs are already formed in the RVB state there is no need for additional boson glue to pair the electrons. The other instead suggests that the d-wave pairs are mediated by the collective bosons like the conventional low $T_c$ SC with the alteration that the phonons are replaced by another kind of bosons ranging from the antiferromagnetic (AF) to loop current fluctuations. An approach to resolve this dispute is to determine the frequency and momentum dependences of the diagonal and off-diagonal self-energies directly from experiments like the McMillan-Rowell procedure for the conventional SC. In that a simple d-wave BCS theory describes superconducting properties of the cuprates well, the Eliashberg analysis of well designed high resolution experimental data will yield the crucial frequency and momentum dependences of the self-energies. This line of approach using ARPES are discussed in more detail in this review, and some remaining problems are commented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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