The Interplay of Long Range Interactions and Electron Density Distributions in Polar and Strongly Correlated Materials

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• 作者：Nikolai Kristoffel ; Aleksandr Pishtshev…
• 关键词：Electron ; phonon interaction ; Polar material ; Ferroelectricity ; Multiband superconductivity
• 刊名：Journal of Superconductivity and Novel Magnetism
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：30
• 期：1
• 页码：91-96
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Strongly Correlated Systems, Superconductivity; Magnetism, Magnetic Materials; Condensed Matter Physics; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1557-1947
• 卷排序：30

文摘

In the present contribution, we summarize the recent theoretical results on the physics of the electron-TO-phonon (el-TO-ph) interaction in polar materials. Within the frameworks of dipole approximation, we linked the interaction of electrons with the long-wavelength transverse optical vibrations to the long-range dipole-dipole interaction. We suggested a macroscopic parameterization of the el-TO-ph coupling constants in terms of experimental material parameters relating to phonon and electron characteristics of the system. The parametrization enabled us to introduce a novel relation that may measure a degree of polarity, and may indicate how close the dielectric behavior of the system is to a structural instability. The ferroelectric tendencies of known crystalline compounds were reproduced. Further considerations were focused on an integrated analysis of charge, electronic, and vibrational properties of iron-based narrow-gap systems FeSi and FeAs₂. Similarly to ferroelectrics, these materials demonstrate a strong interplay of electronic and polarization degrees of freedom, which is mediated by the dynamic hybridization of the relevant frontier orbitals.