Structural aspects of materials with static stripe order
Structural aspects of materials with static stripe order
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DOI：
10.1016/j.physc.2012.04.035
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发表时间：
2012-11-01
影响因子：
1.7
通讯作者：
Huecker, M.
中科院分区：
文献类型：
--
作者：
Huecker, M.
越来越多的铜酸盐超导体显示出纳米尺度上固有的空间电子不均匀。用对样品表面或体积以及其平均或局部结构敏感的各种探头进行了相应的观察。电荷和自旋条纹关联构成了一类不均匀性，最初源于La基铜酸盐上的中子散射数据。到目前为止，在几个体系中观察到了具有非常相似色散的磁激发光谱，这表明无公度自旋涨落是铜酸盐的普遍性质。相反，用散射和隧道技术观察到的电荷条纹关联很难得到统一的图像。本文综述了La基化合物中电荷条纹关联及其与晶格相互作用的证据，这些化合物是目前唯一被证实具有静态自旋和电荷条纹有序的铜酸盐。重点讨论了条带有序与平均和局域结构性质、同位素效应、声子反常和掺杂相关性之间的关系。第二个重要的主题涉及在极端条件下对条纹的研究中获得的新见解，如强磁场和高压。此外，还将讨论正交晶格中条纹的倾斜，以及在金属绝缘体相变下方出现斜电荷条纹的可能性，以及条纹相的替代模型。爱思唯尔出版公司(Elsevier B.V.)
A growing number of cuprate superconductors show evidence of an intrinsic spatial electronic inhomogeneity on a nanometer length scale. Corresponding observations were made with a variety of probes sensitive to the sample's surface or bulk as well as to its average or local structure. Charge and spin stripe correlations constitute one class of inhomogeneity initially derived from neutron scattering data on La-based cuprates. By now magnetic excitation spectra with very similar dispersions were observed in several systems, suggesting that incommensurate spin fluctuations are a universal property of the cuprates. In contrast, it proves much harder to obtain a unified picture for the charge stripe correlations as observed with scattering and tunneling techniques. This article reviews the evidence of charge stripe correlations and their interactions with the crystal lattice in the La-based compounds, which are presently the only cuprates with confirmed static spin and charge stripe order. Particular emphasis is put on the relationship between stripe order and average and local structure properties, isotope effects, phonon anomalies, and doping dependencies. A second important topic concerns new insights obtained in studies of stripes under extreme conditions such as high magnetic fields and high pressure. Furthermore, the tilting of stripes in orthorhombic lattices will be discussed, as well as the possibility of diagonal charge stripes below the metal insulator transition, and alternative models for the stripe phase. Published by Elsevier B.V.