Charge nematicity and electronic Raman scattering in iron-based superconductors
Charge nematicity and electronic Raman scattering in iron-based superconductors
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DOI：
10.1016/j.crhy.2015.10.001
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发表时间：
2016-01-01
影响因子：
1.4
通讯作者：
Paul, Indranil
中科院分区：
文献类型：
--
作者：
Gallais, Yann;Paul, Indranil
本文综述了电子拉曼散射测量铁基超导体中电荷涨落的最新进展。提出了一个简单的理论框架的d波Pomeranchuk过渡，以捕捉显着特点的频谱。我们讨论了现有的拉曼数据在正常状态下的122铁基系统，特别是Co掺杂的BaFe_2As_2，我们表明，低能量准弹性峰，提取的磁化率和散射率是一致的电子驱动的结构相变。在全能隙超导态，准弹性峰转变为有限频率的共振，这在电子掺杂系统中表现得尤为明显。分析的一个重要特征是电子拉曼信号不受声学声子的影响。这使得拉曼光谱成为电子向列性的独特探针。(C)2015年，科学院。由Elsevier Masson SAS出版。
We review the recent developments in electronic Raman scattering measurements of charge nematic fluctuations in iron-based superconductors. A simple theoretical framework of a d-wave Pomeranchuk transition is proposed in order to capture the salient features of the spectra. We discuss the available Raman data in the normal state of 122 iron-based systems, particularly Co-doped BaFe2As2, and we show that the low-energy quasi-elastic peak, the extracted nematic susceptibility and the scattering rates are consistent with an electronic-driven structural phase transition. In the superconducting state with a full gap, the quasi-elastic peak transforms into a finite-frequency nematic resonance, evidences for which are particularly strong in the electron-doped systems. A crucial feature of the analysis is the fact that the electronic Raman signal is unaffected by the acoustic phonons. This makes Raman spectroscopy a unique probe of electronic nematicity. (C) 2015 Academie des sciences. Published by Elsevier Masson SAS.