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Electronic Raman scattering in cuprate superconductors and parent insulating phases

机译:铜酸盐超导体和母体绝缘相中的电子拉曼散射

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Abstract: Raman scattering from charge and spin excitation in cuprates is reviewed. The two-magnon resonance Raman profile is used to determine the most probable energy for photon-assisted charge transfer leading to exchange between two spins. The difference between this energy and that for absorption is attributed to spin relaxation (spin polaron) effects. Two-magnon spectra in superconducting cuprates are presented. It is argued that their presence is evidence that the antiferromagnetic correlation length is equal to or greater than three lattice constants. The recently-discovered Raman-active excitons are described and possible assignments of them are discussed. It is pointed out that in highly correlated metals and insulators, the mechanisms for light scattering that are familiar for doped semiconductors or conventional metals are not necessarily the only ones that are operative.!35
机译:摘要:综述了铜酸盐中电荷和自旋激发引起的拉曼散射。两磁振共振拉曼曲线用于确定光子辅助电荷转移导致两个自旋之间交换的最可能能量。该能量与吸收能量之间的差异归因于自旋弛豫(自旋极化子)效应。给出了超导铜酸盐中的两磁能谱。据认为,它们的存在是反铁磁相关长度等于或大于三个晶格常数的证据。描述了最近发现的拉曼活性激子,并讨论了它们的可能赋值。要指出的是,在高度相关的金属和绝缘体中,掺杂半导体或常规金属所熟悉的光散射机制不一定是唯一起作用的机制。35

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