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Optical properties

Influence of temperature on Raman spectra of the FeS$_2$ single crystal with pyrite structure

A. N. Utyuzh

Institute for High Pressure Physics, Russian Academy of Sciences

Abstract: Raman scattering in a natural FeS$_2$ single crystal with the pyrite structure was investigated in the temperature range of 80–300 K. All five Raman-active modes $E_g$, $T_g$(1), $T_g$(2), $A_g$, and $T_g$(3) were observed under normal conditions ($T$ = 23$^\circ$C). The influence of temperature on the Raman spectra was studied in the $HH$ configurations (polarizations of the incident and scattered radiations are parallel), which made it possible to detect the strongest spectral lines $A_g$ and $E_g$. Widths of modes $E_g$ and $A_g$ were substantially smaller than those given in previous publications. It was found that the temperature dependences of frequencies and widths (FWHM) of modes $A_g$ and $E_g$ are approximated well by the Klemens model, which describes the three-phonon scattering mechanism.

Received: 09.04.2014

 English version: Physics of the Solid State, 2014, 56:10, 2050–2055

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