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arXiv 2607.03022cond-mat.supr-con
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当排斥产生配对:非常规超导的新视角

When Repulsion Creates Pairing: A New Perspective on Unconventional Superconductivity

Laboratoire Charles Coulomb UMR 5221 CNRS-Université de Montpellier(夏尔·库隆实验室);CNRS(法国国家科学研究中心);Université de Montpellier(蒙彼利埃大学)

Patrick Navez

AI总结:

研究在多体相互作用和谷势场中,虽有排斥库仑定律和泡利统计,但电子或空穴间仍可能产生吸引。提出适用于铜酸盐的形式体系,受BCS理论启发得出温度 - 掺杂相图的预测。

摘要:

尽管排斥性的库仑定律和泡利统计不利于束缚态,但在多体相互作用和谷势景观的背景下,电子或空穴之间的吸引力仍然是可能的,这让人联想到奇异的超导材料。特别是,1965年,科恩和卢廷格发表了一篇笔记,揭示了排斥性库仑相互作用的动态屏蔽在某些条件下会导致形成库珀对所需的有效吸引力。我们提出了一种适用于铜酸盐的形式体系,其中屏蔽来自于CuO₂平面氧轨道中虚拟空穴的超交换动力学。受巴丁 - 库珀 - 施里弗(BCS)理论的启发,我们可以得出一些关于温度 - 掺杂相图(赝能隙、奇异金属、反铁磁性、超导和正常态)的预测,这些预测与观测结果半定量一致。

英文摘要:

Despite the repulsive Coulomb law and the Pauli statistics that do not favor bound states, attraction between electrons or holes is nevertheless possible in the context of many body interaction and of valley potential landscapes, reminiscent of exotic superconducting materials. In particular, in 1965, Kohn and Luttinger published a note revealing that the dynamical screening of the repulsive Coulomb interaction leads, under certain conditions, to an effective attraction necessary for the formation of Cooper pairs. We propose such a formalism adapted to the cuprates, where the screening arises from the superexchange dynamics of virtual holes in the oxygen orbitals of the $Cu O_2$ plane. Inspired from the Bardeen-Copper-Schrieffer (BCS) theory, we can derive some predictions for the temperature-doping phase diagram (pseudo-gap, strange metal, antiferromagnetism, superconducting, and normal states) in semi-quantitative agreement with observations.

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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