TY  - JOUR
AU  - Parshin, P. P.
AU  - Chumakov, A. I.
AU  - Alekseev, P. A.
AU  - Nemkovskiy, Kirill
AU  - Dubrovinskii, L.
AU  - Kantor, A.
AU  - Persson, Jörg
AU  - Rüffer, R.
TI  - Peculiarities of FeSi phonon spectrum induced by a change of atomic volume
JO  - Journal of experimental and theoretical physics
VL  - 123
IS  - 6
SN  - 1090-6509
CY  - Heidelberg [u.a.]
PB  - Springer
M1  - FZJ-2017-01588
SP  - 1073 - 1083
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000392931300018
DO  - DOI:10.1134/S1063776116110170
UR  - https://juser.fz-juelich.de/record/827463
ER  -