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Phonons and the electronic gap in FeSi |
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| Authors: | P. P. Parshin P. A. Alekseev K. S. Nemkovskii J. Perßon A. I. Chumakov R. Rüffer |
| Affiliation: | 1. National Research Center Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182, Russia 2. National Research Nuclear University Moscow Engineering Physics Institute, Kashirskoe sh. 31, Moscow, 115409, Russia 3. Julich Centre for Neutron Science, Forschungszentrum Jülich GmbH, Outstation at MLZ, 85747, Garching, Germany 4. Julich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Julich GmbH, 52425, Julich, Germany 5. European Synchrotron Radiation Facility, BP220, 38043, Grenoble, France |
| Abstract: | The partial phonon densities of states of iron atoms in the intermetallic compound FeSi have been measured in the temperature range 46–297 K using nuclear resonant inelastic scattering of synchrotron radiation. A significant phonon softening with increasing temperature has been established. The greatest phonon softening for iron atoms is shown to occur in the region of long-wavelength acoustic phonons, for the acoustic branches near the boundary of the Brillouin zone, and for the low-lying weakly dispersive optical branches. The results obtained are analyzed in terms of the views that relate the change in the phonon density of states of iron atoms to the temperature evolution of the electronic density of state for the compound. |
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