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Journal of Experimental and Theoretical Physics

, Volume 123, Issue 6, pp 1073–1083 | Cite as

Peculiarities of FeSi phonon spectrum induced by a change of atomic volume

  • P. P. Parshin
  • A. I. Chumakov
  • P. A. Alekseev
  • K. S. Nemkovski
  • L. Dubrovinskii
  • A. Kantor
  • J. Perßon
  • R. Rüffer
Electronic Properties of Solid

Abstract

We analyze in detail the results of experimental investigations of the evolution of the thermal vibration spectra for iron atoms in iron monosilicide FeSi depending on two external parameters, viz., temperature T (in the range 46–297 K at pressure P = 0.1 MPa) and pressure P (in the range 0.1 MPa–43 GPa at temperature T = 297 K), obtained by nuclear inelastic scattering of synchrotron radiation. The decrease of the atomic volume is accompanied by a rearrangement of the phonon spectrum, which is manifested, in particular, in the splitting of the low-energy peak in the spectrum and in an increase of the energy for all phonons. The changes of the average energy of the iron atom vibrational spectrum and of the Debye energy with decreasing atomic volume are analyzed. Different versions of FeSi electron spectrum variation, which can be used to explain the observed phonon anomalies, are considered.

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Copyright information

© Pleiades Publishing, Inc. 2016

Authors and Affiliations

  • P. P. Parshin
    • 1
  • A. I. Chumakov
    • 1
    • 2
  • P. A. Alekseev
    • 1
    • 3
  • K. S. Nemkovski
    • 4
  • L. Dubrovinskii
    • 5
  • A. Kantor
    • 2
    • 5
  • J. Perßon
    • 6
  • R. Rüffer
    • 2
  1. 1.National Research Center Kurchatov InstituteMoscowRussia
  2. 2.European Synchrotron Radiation FacilityGrenobleFrance
  3. 3.National Research Nuclear University “MEPhI,”MoscowRussia
  4. 4.Jülich Centre for Neutron Sciences (JCNS), Heinz Maier-Leibnitz Zentrum (MLZ)Forschungszentrum Jülich GmbHGarchingGermany
  5. 5.Bayerisches GeoinstitutUniversität BazreuthBayreuthGermany
  6. 6.Jülich Centre for Neutron Science (JCNS) and Peter Grünberg Institut (PGI)JARA-FIT Forschungszentrum Jülich GmbHJülichGermany

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