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arXiv 1905.10232cond-mat.supr-con
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铜酸盐中电荷密度涨落引起的金属奇异行为

Strange metal behaviour from charge density fluctuations in cuprates

G. Seibold, R. Arpaia, Y. Y. Peng, R. Fumagalli, L. Braicovich, C. Di Castro, M. Grilli, G. Ghiringhelli, S. Caprara

摘要:

除了负责高临界温度超导性的机制之外,铜氧化物的未解决的重大问题是在所谓的赝能隙温度$T^*$以上出现奇怪的金属态。尽管这种状态已经成功地描述在一个唯象方案,所谓的边际费米液体理论,微观解释仍然是失踪。然而,最近的共振X射线散射实验确定了一类新的电荷密度波动,其特征在于低的特征能量和短的相关长度,这与众所周知的电荷密度波。这些波动存在于温度与掺杂相图的宽区域上,并且在$T^*$之上延伸得很好。在这里,我们调查的电子和输运性质的电荷密度波动的后果,并发现它们可以解释奇怪的金属现象。因此,电荷密度波动很可能是长期以来寻求的微观机制的铜酸盐的金属状态的特殊性。

英文摘要:

Besides the mechanism responsible for high critical temperature superconductivity, the grand unresolved issue of the cuprates is the occurrence of a strange metallic state above the so-called pseudogap temperature $T^*$. Even though such state has been successfully described within a phenomenological scheme, the so-called Marginal Fermi-Liquid theory, a microscopic explanation is still missing. However, recent resonant X-ray scattering experiments identified a new class of charge density fluctuations characterized by low characteristic energies and short correlation lengths, which are related to the well-known charge density waves. These fluctuations are present over a wide region of the temperature-vs-doping phase diagram and extend well above $T^*$. Here we investigate the consequences of charge density fluctuations on the electron and transport properties and find that they can explain the strange metal phenomenology. Therefore, charge density fluctuations are likely the long-sought microscopic mechanism underlying the peculiarities of the metallic state of cuprates.

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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