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- Title
The Interplay of Long Range Interactions and Electron Density Distributions in Polar and Strongly Correlated Materials.
- Authors
Kristoffel, Nikolai; Pishtshev, Aleksandr; Rubin, Pavel; Klopov, Mihhail
- Abstract
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 FeAs. 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.
- Subjects
ELECTRON-phonon interactions; FERROELECTRICITY; ELECTRON density; SUPERCONDUCTIVITY; POLARIZATION (Electricity)
- Publication
Journal of Superconductivity & Novel Magnetism, 2017, Vol 30, Issue 1, p91
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-016-3765-y