Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102163
Title: Raman study of coupled electronic and phononic excitations in LuB12
Authors: Ponosov, Y. S.
Makhnev, A. A.
Streltsov, S. V.
Filipov, V. B.
Shitsevalova, N. Y.
Issue Date: 2017
Publisher: Elsevier Ltd
Citation: Raman study of coupled electronic and phononic excitations in LuB12 / Y. S. Ponosov, A. A. Makhnev, S. V. Streltsov, et al. — DOI 10.1016/j.jallcom.2017.01.319 // Journal of Alloys and Compounds. — 2017. — Vol. 704. — P. 390-397.
Abstract: Electronic Raman scattering and optical phonon self-energies are studied on single crystals of LuB12with different isotopic composition in the temperature region 10–650 K and at pressures up to 10 GPa. The shape and energy position of the spectral peaks depend on the magnitude of the probed wave vector, temperature, and symmetry of excitations. We simulated experimental spectra using electronic structure obtained in the density functional theory and taking into account the electron-phonon scattering. The emergence of a broad continuum in the spectra is identified with the inelastic scattering of light from the electronic intraband excitations. Their coupling to non-fully symmetric phonon modes is the source of both the Fano interference and temperature-dependent phonon self-energies. In addition, long wavelength vibrations of the boron atoms are in nonadiabatic regime, so the electronic contribution to their self-energies provides a temperature dependence that is similar to the anharmonic contribution. Comparison of calculation and experiment allowed us to determine the coupling constant λ = 0.32, which gives correct critical temperature of the transition to the superconducting state. © 2017 Elsevier B.V.
Keywords: ANHARMONICITY
ELECTRON-PHONON INTERACTIONS
INELASTIC LIGHT SCATTERING
RARE EARTH ALLOYS AND COMPOUNDS
DENSITY FUNCTIONAL THEORY
ELECTRON-PHONON INTERACTIONS
ELECTRONIC STRUCTURE
INELASTIC SCATTERING
LIGHT SCATTERING
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
SINGLE CRYSTALS
TEMPERATURE DISTRIBUTION
ANHARMONIC CONTRIBUTIONS
ANHARMONICITIES
ELECTRON PHONON SCATTERING
ELECTRONIC CONTRIBUTIONS
ELECTRONIC RAMAN SCATTERING
INELASTIC LIGHT SCATTERING
RARE-EARTH ALLOYS AND COMPOUNDS
TEMPERATURE DEPENDENCE
PHONONS
URI: http://hdl.handle.net/10995/102163
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85012113111
PURE ID: 1619306
f231dff3-2484-4469-a999-86a0df0b146d
ISSN: 9258388
DOI: 10.1016/j.jallcom.2017.01.319
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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