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Pis'ma v Zh. Èksper. Teoret. Fiz., 2016, Volume 103, Issue 5, Pages 359–364 (Mi jetpl4882)  

This article is cited in 2 scientific papers (total in 2 papers)

OPTICS AND NUCLEAR PHYSICS

Raman scattering by electron and phonon excitations in FeSi

Yu. S. Ponosovab, A. O. Shorikovab, S. V. Streltsovab, A. V. Lukoyanovab, N. I. Shchegolikhinaa, A. F. Prekula, V. I. Anisimovab

a Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Yekaterinburg, 620990, Russia
b Ural Federal University, ul. Mira 19, Yekaterinburg, 620002, Russia

Abstract: The temperature evolution of Raman scattering by electron and phonon excitations in FeSi is studied within the range of 10–500 K. At low temperatures, the frequency dependence for the spectra of light scattered by electrons exhibits vanishing intensity in the range up to 500–600 cm$^{-1}$, which suggests the existence of an energy gap of about 70 meV. The calculations of the electronic excitation spectra based on the band structure determined using the LDA+DMFT technique (local electron density + dynamic mean field approximation) are in good agreement with the low-temperature experimental data and confirm that FeSi is a material with intermediate electron correlations. The changes in the shape of the electronic excitation spectrum and in the self-energy of optical phonons indicate a transition to the metallic state above 100 K. The analysis of experimental data demonstrates an appreciable decrease in the electron lifetime with the growth of temperature determining the (insulator-poor metal) transition.

Funding Agency Grant Number
Russian Science Foundation 14-22-00004


DOI: https://doi.org/10.7868/S0370274X16050064

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English version:
Journal of Experimental and Theoretical Physics Letters, 2016, 103:5, 316–320

Bibliographic databases:

Document Type: Article
Received: 21.01.2016
Revised: 01.02.2016

Citation: Yu. S. Ponosov, A. O. Shorikov, S. V. Streltsov, A. V. Lukoyanov, N. I. Shchegolikhina, A. F. Prekul, V. I. Anisimov, “Raman scattering by electron and phonon excitations in FeSi”, Pis'ma v Zh. Èksper. Teoret. Fiz., 103:5 (2016), 359–364; JETP Letters, 103:5 (2016), 316–320

Citation in format AMSBIB
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\by Yu.~S.~Ponosov, A.~O.~Shorikov, S.~V.~Streltsov, A.~V.~Lukoyanov, N.~I.~Shchegolikhina, A.~F.~Prekul, V.~I.~Anisimov
\paper Raman scattering by electron and phonon excitations in FeSi
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
\yr 2016
\vol 103
\issue 5
\pages 359--364
\mathnet{http://mi.mathnet.ru/jetpl4882}
\crossref{https://doi.org/10.7868/S0370274X16050064}
\elib{http://elibrary.ru/item.asp?id=26184385}
\transl
\jour JETP Letters
\yr 2016
\vol 103
\issue 5
\pages 316--320
\crossref{https://doi.org/10.1134/S002136401605012X}
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    Citing articles on Google Scholar: Russian citations, English citations
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    This publication is cited in the following articles:
    1. Stern R., Madsen G.K.H., “Ab initio investigation of the anomalous phonon softening in FeSi”, Phys. Rev. B, 94:14 (2016), 144304  crossref  isi  elib  scopus
    2. Tomczak J.M., “Thermoelectricity in Correlated Narrow-Gap Semiconductors”, J. Phys.-Condes. Matter, 30:18 (2018), 183001  crossref  isi  scopus
  •       Pis'ma v Zhurnal ksperimental'noi i Teoreticheskoi Fiziki
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