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Probing Phase Separation and Local Lattice Distortions in Cuprates by Raman Spectroscopy

机译:拉曼光谱法探测磷酸酯中的相分离与局部格畸变

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摘要

It is generally accepted that high temperature superconductors emerge when extra carriers are introduced in the parent state, which looks like a Mott insulator. Competition of the order parameters drives the system into a poorly defined pseudogap state before acquiring the normal Fermi liquid behavior with further doping. Within the low doping level, the system has the tendency for mesoscopic phase separation, which seems to be a general characteristic in all high Tc compounds, but also in the materials of colossal magnetoresistance or the relaxor ferroelectrics. In all these systems, metastable phases can be created by tuning physical variables, such as doping or pressure, and the competing order parameters can drive the compound to various states. Structural instabilities are expected at critical points and Raman spectroscopy is ideal for detecting them, since it is a very sensitive technique for detecting small lattice modifications and instabilities. In this article, phase separation and lattice distortions are examined on the most characteristic family of high temperature superconductors, the cuprates. The effect of doping or atomic substitutions on cuprates is examined concerning the induced phase separation and hydrostatic pressure for activating small local lattice distortions at the edge of lattice instability.
机译:通常接受高温超导体在父状态中引入额外的载体时出现,看起来像Mott Insulator。订单参数的竞争将系统驱动到定义良好定义的伪影像状态,然后以进一步的掺杂获取正常的费米液体行为。在低掺杂水平内,该系统具有介观相分离的趋势,这似乎是所有高TC化合物中的一般特征,而且在巨大磁阻的材料中或松弛的铁电气。在所有这些系统中,可以通过调整诸如掺杂或压力的物理变量来创建亚稳相,并且竞争订单参数可以将化合物驱动到各种状态。预期结构不稳定性是在关键点和拉曼光谱的理想选择,因为它是检测小格子修改和稳定性的非常敏感的技术。在本文中,在高温超导体家族中,在高温超导体,铜酸酯上检查相分离和晶格畸变。研究掺杂或原子取代对铜酸酯的影响,关于诱导的相分离和静液压压力,用于在晶格不稳定的边缘激活小局部晶格畸变。

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  • 作者

    Efthymios Liarokapis;

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  • 年度 2019
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  • 原文格式 PDF
  • 正文语种 eng
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